27 CSS Calendar Designs 06 / 27

Responsive Mobile-Friendly Calendar UI

An organic green calendar built to scale across three breakpoints.

CSS + JS MIT licensed
Live Demo Open in tab
Open in playground

The code

<div class="cal06">
  <div class="cal06__layout">

    <!-- Main calendar -->
    <div class="cal06__main">

      <div class="cal06__top">
        <div class="cal06__month-block">
          <div class="cal06__month-label">June</div>
          <div class="cal06__year-label">2026 · Q2</div>
        </div>
        <div class="cal06__top-right">
          <div class="cal06__nav-row">
            <div class="cal06__nav-btn">‹</div>
            <div class="cal06__nav-btn">›</div>
          </div>
          <div class="cal06__today-pill">Today</div>
        </div>
      </div>

      <div class="cal06__dow">
        <div class="cal06__dow-lbl">S</div>
        <div class="cal06__dow-lbl">M</div>
        <div class="cal06__dow-lbl">T</div>
        <div class="cal06__dow-lbl">W</div>
        <div class="cal06__dow-lbl">T</div>
        <div class="cal06__dow-lbl">F</div>
        <div class="cal06__dow-lbl">S</div>
      </div>

      <div class="cal06__grid" id="cal06Grid">
        <!-- May overflow -->
        <div class="cal06__cell other weekend"><div class="cal06__cell-n">25</div></div>
        <div class="cal06__cell other"><div class="cal06__cell-n">26</div></div>
        <div class="cal06__cell other"><div class="cal06__cell-n">27</div></div>
        <div class="cal06__cell other"><div class="cal06__cell-n">28</div></div>
        <div class="cal06__cell other"><div class="cal06__cell-n">29</div></div>
        <div class="cal06__cell other"><div class="cal06__cell-n">30</div></div>
        <div class="cal06__cell other weekend"><div class="cal06__cell-n">31</div></div>
        <!-- June 1-7 -->
        <div class="cal06__cell weekend"><div class="cal06__cell-n">1</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">2</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--g"></span></div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">3</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">4</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--y"></span></div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">5</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">6</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--p"></span></div></div>
        <div class="cal06__cell weekend"><div class="cal06__cell-n">7</div></div>
        <!-- June 8-14: today=8 -->
        <div class="cal06__cell today weekend"><div class="cal06__cell-n">8</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--g"></span></div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">9</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--g"></span><span class="cal06__pip cal06__pip--l"></span></div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">10</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">11</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--p"></span></div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">12</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">13</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--y"></span></div></div>
        <div class="cal06__cell weekend"><div class="cal06__cell-n">14</div></div>
        <!-- June 15-21 -->
        <div class="cal06__cell weekend"><div class="cal06__cell-n">15</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">16</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">17</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--g"></span><span class="cal06__pip cal06__pip--g"></span></div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">18</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">19</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">20</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--l"></span></div></div>
        <div class="cal06__cell weekend"><div class="cal06__cell-n">21</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--y"></span></div></div>
        <!-- June 22-28 -->
        <div class="cal06__cell weekend"><div class="cal06__cell-n">22</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">23</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">24</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--p"></span></div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">25</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">26</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">27</div><div class="cal06__pips"><span class="cal06__pip cal06__pip--g"></span></div></div>
        <div class="cal06__cell weekend"><div class="cal06__cell-n">28</div></div>
        <!-- June 29-30 + July -->
        <div class="cal06__cell weekend"><div class="cal06__cell-n">29</div></div>
        <div class="cal06__cell"><div class="cal06__cell-n">30</div></div>
        <div class="cal06__cell other"><div class="cal06__cell-n">1</div></div>
        <div class="cal06__cell other"><div class="cal06__cell-n">2</div></div>
        <div class="cal06__cell other"><div class="cal06__cell-n">3</div></div>
        <div class="cal06__cell other"><div class="cal06__cell-n">4</div></div>
        <div class="cal06__cell other weekend"><div class="cal06__cell-n">5</div></div>
      </div>

    </div>

    <!-- Side panel -->
    <div class="cal06__side">

      <div class="cal06__side-card">
        <div class="cal06__side-label">Selected Day</div>
        <div class="cal06__date-big" id="cal06DateBig">08</div>
        <div class="cal06__date-info">Sunday, June 2026</div>
      </div>

      <div class="cal06__side-card">
        <div class="cal06__side-label">Upcoming Events</div>
        <div class="cal06__ev">
          <div class="cal06__ev-dot" style="background:var(--green)"></div>
          <div class="cal06__ev-body">
            <div class="cal06__ev-name">Sprint Planning</div>
            <div class="cal06__ev-time">Mon Jun 9 · 10:00 AM</div>
          </div>
        </div>
        <div class="cal06__ev">
          <div class="cal06__ev-dot" style="background:var(--peach)"></div>
          <div class="cal06__ev-body">
            <div class="cal06__ev-name">Product Launch</div>
            <div class="cal06__ev-time">Wed Jun 11 · 9:00 AM</div>
          </div>
        </div>
        <div class="cal06__ev">
          <div class="cal06__ev-dot" style="background:var(--yellow)"></div>
          <div class="cal06__ev-body">
            <div class="cal06__ev-name">Demo Day</div>
            <div class="cal06__ev-time">Fri Jun 13 · 2:00 PM</div>
          </div>
        </div>
      </div>

      <div class="cal06__side-card">
        <div class="cal06__side-label">Week Activity</div>
        <div class="cal06__week-bars">
          <div class="cal06__bar-col"><div class="cal06__bar" style="height:20px;opacity:.3"></div><div class="cal06__bar-lbl">S</div></div>
          <div class="cal06__bar-col"><div class="cal06__bar" style="height:32px"></div><div class="cal06__bar-lbl">M</div></div>
          <div class="cal06__bar-col"><div class="cal06__bar" style="height:18px;opacity:.5"></div><div class="cal06__bar-lbl">T</div></div>
          <div class="cal06__bar-col"><div class="cal06__bar" style="height:36px"></div><div class="cal06__bar-lbl">W</div></div>
          <div class="cal06__bar-col"><div class="cal06__bar" style="height:28px;opacity:.8"></div><div class="cal06__bar-lbl">T</div></div>
          <div class="cal06__bar-col"><div class="cal06__bar" style="height:22px;opacity:.6"></div><div class="cal06__bar-lbl">F</div></div>
          <div class="cal06__bar-col"><div class="cal06__bar" style="height:10px;opacity:.25"></div><div class="cal06__bar-lbl">S</div></div>
        </div>
      </div>

    </div>

  </div>
</div>
.cal06, .cal06 *, .cal06 *::before, .cal06 *::after {
  box-sizing: border-box; margin: 0; padding: 0;
}
.cal06 ::selection { background: #5b7e5f; color: #fff; }

.cal06 {
  --bg:      #eef3ec;
  --surface: #f7faf5;
  --card:    #ffffff;
  --ink:     #1e2b1f;
  --ink2:    #4a5e4c;
  --muted:   #8fa892;
  --green:   #5b7e5f;
  --green2:  #3d6641;
  --peach:   #e07a5f;
  --yellow:  #f2b94b;
  --lavender:#9b89c4;
  --today-bg:#e8f0e9;
  --sel-bg:  #5b7e5f;

  font-family: 'Plus Jakarta Sans', sans-serif;
  background: var(--bg);
  background-image:
    radial-gradient(circle at 20% 80%, rgba(91,126,95,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(242,185,75,0.06) 0%, transparent 50%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  color: var(--ink);
}

@keyframes cal06-in {
  from { opacity: 0; transform: scale(0.97) translateY(12px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes cal06-pulse-ring {
  0%   { box-shadow: 0 0 0 0 rgba(91,126,95,0.4); }
  70%  { box-shadow: 0 0 0 8px rgba(91,126,95,0); }
  100% { box-shadow: 0 0 0 0 rgba(91,126,95,0); }
}
@keyframes cal06-slide {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ── Outermost: full desktop layout ── */
.cal06__layout {
  display: grid;
  grid-template-columns: 1fr 310px;
  gap: 20px;
  max-width: 860px;
  width: 100%;
  animation: cal06-in 0.5s cubic-bezier(0.22,1,0.36,1) both;
}

/* ── Main Card ── */
.cal06__main {
  background: var(--card);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(30,43,31,0.08), 0 1px 4px rgba(30,43,31,0.06);
}

/* ── Top strip: month + year ── */
.cal06__top {
  background: var(--green);
  padding: 24px 28px 20px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}
.cal06__top::before {
  content: '';
  position: absolute;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  top: -60px; right: -60px;
}
.cal06__top::after {
  content: '';
  position: absolute;
  width: 100px; height: 100px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  bottom: -30px; left: 40px;
}

.cal06__month-block { position: relative; z-index: 1; }

.cal06__month-label {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 44px;
  font-weight: 700;
  color: #fff;
  line-height: 1;
}

.cal06__year-label {
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,0.65);
  letter-spacing: 0.12em;
  margin-top: 4px;
}

.cal06__top-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  position: relative; z-index: 1;
}

.cal06__nav-row {
  display: flex;
  gap: 6px;
}

.cal06__nav-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background 0.2s;
  user-select: none;
}
.cal06__nav-btn:hover { background: rgba(255,255,255,0.28); }

.cal06__today-pill {
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 20px;
  cursor: pointer;
}

/* ── DOW row ── */
.cal06__dow {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  padding: 12px 16px 6px;
  background: var(--surface);
}
.cal06__dow-lbl {
  text-align: center;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 6px 0;
}
.cal06__dow-lbl:first-child,
.cal06__dow-lbl:last-child { color: var(--green); opacity: 0.7; }

/* ── Grid ── */
.cal06__grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  padding: 6px 16px 20px;
  gap: 4px;
}

.cal06__cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 2px 4px;
  border-radius: 14px;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
  min-height: 52px;
  position: relative;
}
.cal06__cell:hover { background: var(--today-bg); transform: scale(1.04); }
.cal06__cell.other { opacity: 0.22; pointer-events: none; }

.cal06__cell-n {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  line-height: 1;
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  transition: all 0.15s;
}
.cal06__cell.weekend .cal06__cell-n { color: var(--green); }

.cal06__cell.today .cal06__cell-n {
  background: var(--green);
  color: #fff;
  font-weight: 700;
  animation: cal06-pulse-ring 2.5s ease-in-out infinite;
}

.cal06__cell.selected .cal06__cell-n {
  background: var(--peach);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(224,122,95,0.45);
}

/* Event pips below number */
.cal06__pips {
  display: flex;
  gap: 3px;
  margin-top: 3px;
}
.cal06__pip {
  width: 5px; height: 5px;
  border-radius: 50%;
}
.cal06__pip--g { background: var(--green); }
.cal06__pip--p { background: var(--peach); }
.cal06__pip--y { background: var(--yellow); }
.cal06__pip--l { background: var(--lavender); }

/* ── Right panel (desktop only) ── */
.cal06__side {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.cal06__side-card {
  background: var(--card);
  border-radius: 20px;
  padding: 22px;
  box-shadow: 0 4px 20px rgba(30,43,31,0.07);
}

.cal06__side-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

/* Mini date display */
.cal06__date-big {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 64px;
  font-weight: 700;
  color: var(--green2);
  line-height: 1;
}
.cal06__date-info {
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}

/* Event items */
.cal06__ev {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(30,43,31,0.06);
  animation: cal06-slide 0.3s ease both;
}
.cal06__ev:last-child { border-bottom: none; padding-bottom: 0; }
.cal06__ev:nth-child(2) { animation-delay: 0.06s; }
.cal06__ev:nth-child(3) { animation-delay: 0.12s; }

.cal06__ev-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.cal06__ev-body { flex: 1; min-width: 0; }
.cal06__ev-name {
  font-size: 13px; font-weight: 600; color: var(--ink);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.cal06__ev-time { font-size: 11px; color: var(--muted); margin-top: 2px; }

/* Week summary mini bars */
.cal06__week-bars {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  align-items: flex-end;
  height: 40px;
}
.cal06__bar-col { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.cal06__bar {
  width: 100%;
  background: var(--green);
  border-radius: 3px 3px 0 0;
  opacity: 0.7;
  transition: opacity 0.2s;
}
.cal06__bar:hover { opacity: 1; }
.cal06__bar-lbl { font-size: 8px; color: var(--muted); font-weight: 600; letter-spacing: 0.05em; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   RESPONSIVE: tablet → collapse to 1 col
   RESPONSIVE: mobile → compact top strip,
   smaller cells, hide side panel under grid
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
@media (max-width: 780px) {
  .cal06__layout {
    grid-template-columns: 1fr;
    max-width: 500px;
  }
  .cal06__side { display: none; }
}

@media (max-width: 480px) {
  .cal06__top { padding: 18px 20px 16px; }
  .cal06__month-label { font-size: 34px; }
  .cal06__dow { padding: 8px 10px 4px; }
  .cal06__grid { padding: 4px 10px 14px; gap: 2px; }
  .cal06__cell { min-height: 42px; border-radius: 10px; }
  .cal06__cell-n { width: 28px; height: 28px; font-size: 13px; }
  .cal06__today-pill { display: none; }
}

@media (max-width: 360px) {
  .cal06__month-label { font-size: 28px; }
  .cal06__cell-n { width: 24px; height: 24px; font-size: 11px; }
  .cal06__dow-lbl { font-size: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .cal06 * { animation: none !important; transition: none !important; }
}
document.querySelectorAll('#cal06Grid .cal06__cell:not(.other)').forEach(cell => {
  cell.addEventListener('click', function() {
    document.querySelectorAll('#cal06Grid .cal06__cell').forEach(c => c.classList.remove('selected'));
    this.classList.add('selected');
    const n = this.querySelector('.cal06__cell-n').textContent;
    const el = document.getElementById('cal06DateBig');
    if (el) el.textContent = n.padStart(2,'0');
  });
});

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