#open,
#close {
    cursor: pointer;
    width: 200px;
    border: 1px solid #ccc;
    border-radius: 4px;
    text-align: center;
    padding: 12px;
    margin: 16px auto 0;
    background: #333;
    color: white;
}
#mask {
    background: rgba(0, 0, 0, 0.4);
    position: fixed;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    z-index: 1;
}

#modal {
    background: #fff;
    color: #555;
    width: 450px;
    padding: 40px;
    border-radius: 4px;
    position: absolute;
    top: calc(50% - 80px);
    left: 0;
    right: 0;
    margin: 0 auto;
    z-index: 2;
    transition: 0.4s;
    opacity: 1;
}

#modal p {
    margin: 0 0 20px;
    text-align: center;
}

#modal .form-before-title {
    font-size: 18px;
    font-weight: bold;
}

#modal .form-before-lead {
    padding-bottom: 20px;
}

#mask.hidden {
    display: none;
}

#modal.hidden {
    display: none;
}
.display-none {
    display: none;
}

@media screen and (max-width: 768px) {
    #modal {
        width: 95vw;
        padding: 20px 0px;
        margin: 0 auto;
    }
    #modal .form-before-title {
        font-size: 15px;
    }
    #modal .form-before-lead {
        font-size: 13px;
    }
}