:root {
    --font-color: #555;
    --font-hover-color: orange;
}

.form-group {
    margin-bottom: 1.5em;
    transition: all .3s;
}

.form-label {
    font-size: .75em;
    color: var(--font-color);
    display: block;
    opacity: 0;
    transition: all .3s;
    transform: translateX(-50px);
}

.form-control {
    box-shadow: none;
    border-radius: 0;
    border-color: #ccc;
    border-style: none none solid none;
    width: 50%;
    font-size: 1.25em;
    transition: all .6s;
}

.form-control::placeholder {
    color: #aaa;
}

.form-control:focus {
    box-shadow: none;
    border-color: var(--font-hover-color);
    outline: none;
}

.form-group:focus-within {
    transform: scale(1.1, 1.1);
}

.form-control:invalid:focus {
    border-color: red;
}

.form-control:valid:focus {
    border-color: green;
}

.btn {
    background: 0 0 #fff;
    border: 1px solid #aaa;
    border-radius: 3px;
    color: var(--font-color);
    font-size: 1em;
    padding: 10 50px;
    text-transform: uppercase;
}

.btn:hover {
    border-color: var(--font-hover-color);
    color: var(--font-hover-color);
}

textarea {
    resize: none;
}

.focused>.form-label {
    opacity: 1;
    transform: translateX(0px);
}