<label class="if-float">
  <input type="email" name="email" autocomplete="email" placeholder=" " required />
  <span class="if-float-label">Email address</span>
</label>

.if-float {
  position: relative;
  display: block;
  width: 100%;
  max-width: 280px;
}

.if-float input {
  width: 100%;
  box-sizing: border-box;
  padding: 18px 14px 8px;
  background: #1a1a22;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  color: #f0eeff;
  font-size: 14px;
  outline: none;
  transition:
    border-color 0.2s,
    background 0.2s;
}

.if-float input:focus {
  border-color: #7c6cff;
  background: #1f1f2a;
}

.if-float-label {
  position: absolute;
  left: 14px;
  top: 14px;
  font-size: 13px;
  color: #b8b6d4;
  pointer-events: none;
  transition:
    transform 0.2s,
    font-size 0.2s,
    color 0.2s;
}

.if-float input:focus + .if-float-label,
.if-float input:not(:placeholder-shown) + .if-float-label {
  transform: translateY(-9px);
  font-size: 10px;
  color: #a78bfa;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}