.theme-btn{
        border:none;
        background:none;
        font-size:18px;
        color:inherit;
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .theme-btn i{
        font-size:1.6rem;
        transition: transform 0.4s ease;
    }

    .theme-btn:active{
        transform: rotate(180deg) scale(1.2);
    }