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.back-button{color:#10b981;background:#10b98114}.topic-typing .video-container{background:#10b98108;border-color:#10b9811f}.topic-typing .video-placeholder{color:#10b981}@media (width<=800px){.topic-title{letter-spacing:-1px!important;font-size:3rem!important}.topic-description{font-size:.95rem}.topic-nav{padding:16px 20px}.topic-content{padding:0 20px 60px}.chess-board-pattern{width:300px;height:300px}.knight-piece{width:80px}.queen-piece{width:70px}.hangul-watermark{font-size:12rem}.hangul-3{font-size:8rem}}