32 CSS Search Box & Search Bar Designs 01 / 32
Minimal Underline
Borderless input with a thin bottom rule that animates outward from the centre on focus — the cleanest pattern that still signals interactivity.
The code
<form class="csb-min" role="search"> <label class="csb-sr" for="csb-min-i">Search</label> <input id="csb-min-i" type="search" name="q" placeholder="Search anything..." /> </form>
<form class="csb-min" role="search">
<label class="csb-sr" for="csb-min-i">Search</label>
<input id="csb-min-i" type="search" name="q" placeholder="Search anything..." />
</form>.csb-min { position: relative; display: inline-block; }
.csb-min input {
width: 240px; padding: 8px 0;
border: 0; outline: none;
background: transparent;
color: #f0eeff; font: 500 14px/1 system-ui, sans-serif;
border-bottom: 1px solid #2a2a3e;
}
.csb-min input::placeholder { color: #b8b6d4; }
.csb-min::after {
content: ''; position: absolute;
left: 50%; bottom: 0;
width: 0; height: 2px;
background: #7c6cff;
transform: translateX(-50%);
transition: width 0.3s ease;
}
.csb-min:focus-within::after { width: 100%; }
.csb-sr {
position: absolute !important;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border: 0;
}
.csb-min { position: relative; display: inline-block; }
.csb-min input {
width: 240px; padding: 8px 0;
border: 0; outline: none;
background: transparent;
color: #f0eeff; font: 500 14px/1 system-ui, sans-serif;
border-bottom: 1px solid #2a2a3e;
}
.csb-min input::placeholder { color: #b8b6d4; }
.csb-min::after {
content: ''; position: absolute;
left: 50%; bottom: 0;
width: 0; height: 2px;
background: #7c6cff;
transform: translateX(-50%);
transition: width 0.3s ease;
}
.csb-min:focus-within::after { width: 100%; }
.csb-sr {
position: absolute !important;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border: 0;
}
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