.contact_error {
    font-size: 12px;
    color: red;
}

.form-group {
    margin-bottom: 10px;
    position: relative;
    padding-bottom: 15px;
}

    .form-group span {
        position: absolute;
        bottom: 0px;
        left: 0px;
        width: 100%;
        font-size: 12px;
        color: red;
    }