.back-to-top-button{isolation:isolate;border:0;border-radius:0;background:transparent;filter:drop-shadow(0 3px 5px rgb(0 0 0 / 22%))}.back-to-top-button:before{position:absolute;inset:0;z-index:-1;content:"";pointer-events:none;background:var(--color-surface-muted);clip-path:polygon(4px 0,calc(100% - 4px) 0,100% 4px,100% calc(100% - 4px),calc(100% - 4px) 100%,4px 100%,0 calc(100% - 4px),0 4px);transition:background-color .18s ease}@media(hover:hover){.back-to-top-button:hover:before{background:var(--color-surface-raised)}}.back-to-top-button:focus-visible{outline:none}.back-to-top-button:focus-visible:before{box-shadow:inset 0 0 0 2px var(--color-outline-variant-focus)}@media(prefers-reduced-motion:reduce){.back-to-top-button:before{transition:none}}