.simple-register {
    max-width: 400px;
    padding: 10px 22px 22px;
    background-color: #F5F5F5;
    border-radius: 10px;
}

.simple-register input[type=text] {
    display: block;
    width: 100%;
    padding: 8px 16px;
    border: solid 1px #DDD;
    border-radius: 5px;
    margin: 16px 0;
}

.simple-register input[type=text].error {
    border-color: #900;
}

.simple-register input[type=text].valid {
    border-color: #090;
}

.simple-register label.error {
    color: #900;
    position: absolute;
    margin-top: -20px;
    font-size: 12px;
}

.simple-register__button {
    display: block;
    width: 100%;
    padding: 8px 16px;
    border-radius: 5px;
    background-color: #333;
    border: solid 1px #333;
    color: #FFF;
    text-align: center;
}

.simple-register__button:hover {
    text-decoration: none;
    background-color: #FFF;
    color: #333;
}