.group {
    position: relative;
    margin: 30px 20px 50px;
}

input {
    color: #424242;
    font-size: 1.2em;
    padding: 10px 10px 5px 5px;
    display: block;
    width: 300px;
    border: none;
    border-bottom: 1px solid #607D8B;
}
input:focus {
    outline: none;
}

label.input-label {
    color: #616161;
    position: absolute;
}

input:focus ~ label.input-label {
    color: #0288D1;
}

input[readonly] ~ label.input-label {
    top: -15px;
    font-size: 0.9em;
}

.bar {
    position: relative;
    display: block;
    width: 315px;
}

.bar:before,
.bar:after {
    background: #0288D1;
    content: '';
    height: 2px;
    width: 0;
    bottom: 1px;
    position: absolute;
    transition: 0.2s ease all;
    -moz-transition: 0.2s ease all;
    -webkit-transition: 0.2s ease all;
}

.bar:before {
    left: 50%;
}

.bar:after {
    right: 50%;
}

input:focus ~ .bar:before,
input:focus ~ .bar:after {
    width: 50%;
}