.theme-toggle {
    background: rgba(255,255,255,.12);
    border: none;
    color: #f8fafc;
    font-size: 18px;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .25s ease, transform .2s ease;
}

    .theme-toggle:hover {
        background: rgba(255,255,255,.25);
        transform: scale(1.05);
    }
    .theme-toggle:focus,
    .theme-toggle:active {
        outline: none;
        box-shadow: none;
    }
    .theme-toggle:focus-visible {
        outline: none;
    }