#sidebar{display:none}#main-content .container:before{background:none}@media (min-width:981px){#left-area{width:100%;padding-right:0px!important}}.fixed-background{width:100vw;margin-left:calc(50% - 50vw);margin-right:calc(50% - 50vw);background-image:url("http://oyagaku.com/wp-content/uploads/2026/02/background.avif");background-attachment:fixed;background-size:cover;background-position:center;padding:0}.fixed-background .lp-container{width:min(540px,100%);margin-left:auto;margin-right:auto;padding-left:0;padding-right:0}.fixed-background img{width:100%;height:auto;display:block}