/* 벽들 */
#house{
position:absolute;
width:100%;height:100vh;
transform-style:preserve-3d;
}
/* 좌측 우측 */
.wall-left,.wall-right{
position:absolute;
top:0;
width:500vw;height:100vh;
background:linear-gradient(to right, rgba(255,255,255,.3), rgba(255,255,255,.8));
transform-origin:left center;
transform:rotateY(-90deg);
}
.wall-left{left:0;}
.wall-right{left:100%;}
