body{background-color:#000;background-image:linear-gradient(to bottom right,#020024,#252c2b);background-repeat:no-repeat;background-attachment:fixed}#bubbles{position:absolute;height:100%;width:100%;z-index:-1}.bubble{position:fixed;border-radius:50%;opacity:0;transform:translateX(-50%) translateY(-50%);z-index:-1;animation-name:wave;animation-duration:10s;animation-iteration-count:infinite;animation-timing-function:ease-in-out;transition:opacity 5s}