.theme-btn{position:fixed;bottom:40%;right:0;z-index:100000000;color:var(--text-color);border:none;border-radius:50%;width:35px;height:35px;cursor:pointer;transition:background-color .3s,color .3s;font-size:20px;background-color:var(--secondary-color);display:flex;align-content:center;justify-content:center}