body {
    background: #333333;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    min-width: 300px;
  
}

#main {
  
    background-color: red;
    /*max-width: 800px;*/
    height: 99%;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 5px;

 }

#top {
  
    background-color: #333333;
    width: 100%;
    height: 40px;
    display: flex;
    align-items: center;
 }
#center {
    background-color:#333333;
    width: 100%;
    height: 100%;
    }
#btn {
    background-image: url(/ico/setting-100.png);
    background-size: 50%;
    background-repeat: no-repeat;
    background-position: center;
    background-color: #333333;
    height: 100%;
    /* border-radius: 0%; */
    aspect-ratio: 1/1;
    border: none;
}
.btnform{
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
}
#title {
width: 50%;
text-align:end;
color: #CCCCCC;
}
#num {
padding-left: 10px;
color: #CCCCCC;
}
#setting {
    overflow: auto;
    background-color: #CCCCCC;
    width: 100%;
    height: 100%;
    display: none;
    align-items: center;
    /*justify-content: center;*/
    flex-direction: column;
}