@media(max-width:980px){
.banner-rinki{
    width: 100%;
    height:461px;
    overflow: hidden;
    position: relative;
}
.banner-rinki video{
    width:100%; 
    height: 870px;
    position: absolute;
    top:-250px;
}
}

@media(max-width:838px){
.banner-rinki{
    width: 100%;
    height:383px;
    overflow: hidden;
    position: relative;
}
.banner-rinki video{
    width:100%; 
    height: 870px;
    position: absolute;
    top:-250px;
}
}