opt.css

body{
    margin: 0;
    overscroll-behavior: none;
}
header{
    font-size: 24px;
    padding: 10px;
    color: #505050;
    background: #f0f0f0;
    border-bottom: 2px solid #a0a0a0;
    position: fixed;
    width: 100%;
    box-sizing: border-box;
}
.form{
    padding: 12px;
}
.form select{
    margin-right: 10px;
    padding: 2px 15px;
    width: 80px;
    height: 40px;
    font-size: 15px;
    border: 1px solid #444444;
}
.form-title{
    font-size: 18px;
    padding: 2px 10px;
    border-bottom: 2px solid dodgerblue;
    border-left: 12px solid dodgerblue;
}
.form-content{
    padding-top: 4px;
    padding-left: 22px;
}
.desc{
    padding: 5px 0;
    font-size: 15px;
}
header #apply{
    position: absolute;
    right: 8px;
    top: 8px;
}
#popup{
    display: none;
    font-size: 18px;
    position: absolute;
    background: #ffffff;
    padding: 15px;
    position: fixed;
    top: 0px;
    box-sizing: border-box;
    left: 0;
    width: 100%;
    box-shadow: 0 2px 12px 0 rgba(0,0,0,.5);
}

#popup-div{
    text-align: right;
}