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<body>
<div class="wave-group">
<input required="" type="text" class="input">
<span class="bar"></span>
<label class="label">
<span class="label-char" style="--index: 0">N</span>
<span class="label-char" style="--index: 1">a</span>
<span class="label-char" style="--index: 2">m</span>
<span class="label-char" style="--index: 3">e</span>
</label>
</div>
</body>
<style>
body {
padding: 200px;
}
.wave-group {
position: relative;
}
.wave-group .input {
font-size: 16px;
padding: 10px 10px 10px 5px;
display: block;
width: 200px;
border: none;
border-bottom: 1px solid #515151;
background: transparent;
}
.wave-group .input:focus {
outline: none;
}
.wave-group .label {
color: #999;
font-size: 18px;
font-weight: normal;
position: absolute;
pointer-events: none;
left: 5px;
top: 10px;
display: flex;
}
.wave-group .label-char {
transition: 0.2s ease all;
transition-delay: calc(var(--index) * .05s);
}
.wave-group .input:focus~label .label-char,
.wave-group .input:valid~label .label-char {
transform: translateY(-20px);
font-size: 14px;
color: #5264AE;
}
.wave-group .bar {
position: relative;
display: block;
width: 200px;
}
.wave-group .bar:before,
.wave-group .bar:after {
content: '';
height: 2px;
width: 0;
bottom: 1px;
position: absolute;
background: #5264AE;
transition: 0.2s ease all;
-moz-transition: 0.2s ease all;
-webkit-transition: 0.2s ease all;
}
.wave-group .bar:before {
left: 50%;
}
.wave-group .bar:after {
right: 50%;
}
.wave-group .input:focus~.bar:before,
.wave-group .input:focus~.bar:after {
width: 50%;
}
</style>
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