童軍人口統計

.drive-ratio{
width: min(900px, 100%);
margin: 0 auto;
padding: 0 12px;
aspect-ratio: 4 / 3; /* 640x480 */
border-radius: 18px;
overflow: hidden;
border: 1px solid rgba(0,0,0,.10);
box-shadow: 0 14px 40px rgba(0,0,0,.18);
background: rgba(255,255,255,.85);
}
.drive-ratio iframe{
width: 100%;
height: 100%;
border: 0;
display: block;
}

/* 舊瀏覽器後備（極少數） */
@supports not (aspect-ratio: 1 / 1){
.drive-ratio{
position: relative;
padding-top: 75%; /* 4:3 */
height: 0;
}
.drive-ratio iframe{
position: absolute;
inset: 0;
}
}