JSFiddle - React, Tailwind, and code Playground

HTML

<div class="input">
  <input type="email" name="login_email" required="" value=""/>
  <label for="login_email">Email</label>
</div>

CSS

.input{
    position: relative;
    padding-top:20px;
}
.input > label {
    color: #808590;
    font-size: 15px;
    position: absolute;
    top: 25px;
    left: 2px;
    -webkit-transition: all 200ms ease-in;
    transition: all 200ms ease-in;
}
.input > input {
    box-shadow: none;
    border: 0;
    border-bottom: 1px solid #e2e8ed;
    padding: 5px;
    margin-bottom: 1px;
    border-radius: 2px;
    outline: none;
    font-family: inherit;
    font-size: 14px;
}
.input input:focus + label {
    color: #808590;
    font-size: 13px;
    position: absolute;
    top: 0;
}