style.css

html {
    background: url("https://cdn.glitch.com/29e6951a-6dd3-4b12-a147-f5d76d8de175%2Fbackground.png?v=1601224963591") no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

body {
    /*the overflow is clipped, and the rest of the content is hidden */
    overflow: hidden;
    text-align: center;
    height: 100%;
    width: 100%;
}

.header {
    padding: 10px;
    text-align: center;
    color: paleturquoise;
    font-size: 30px;
    font-family : "Arial Black", Gadget, sans-serif;
    margin: 0 auto;
}

.footer {
    padding: 20px;
    text-align: left;
    color: paleturquoise;
    font-size: 14px;
    font-family : "Arial Black", Gadget, sans-serif;
    position: fixed;
    bottom: 0;
}

section {
    height: 100%;
    width: 100%;
}

span {
    /* span is positioned relative to the nearest positioned ancestor*/
    position: absolute;
    /* The pointer-events CSS property sets under what circumstances (if any)
    a particular graphic element can become the target of pointer events.
    none => The element is never the target of pointer events. */
    pointer-events: none;
    /* Animation */
    background-color: paleturquoise;
    animation-name: spanAnimate;
    animation-duration: 7.5s;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}

@keyframes spanAnimate {
    0% {
        transform: scale(0) translateY(0) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    70% {
        opacity: 1;
    }
    100% {
        transform: scale(1) translateY(-500%) rotate(360deg);
        opacity: 0;
    }

}

bleep {
    /* span is positioned relative to the nearest positioned ancestor*/
    position: absolute;
    /* The pointer-events CSS property sets under what circumstances (if any)
    a particular graphic element can become the target of pointer events.
    none => The element is never the target of pointer events. */
    pointer-events: none;
    /* Animation */
    background-color: gold;
    animation-name: bleepAnimate;
    animation-duration: 0.5s;
    animation-timing-function: ease-out;
    animation-iteration-count: 1;
}

/* set the default transition time */
:root {
    --movAmtY: 250%;
    --movAmtX: 250%;
}

@keyframes bleepAnimate {
    0% {
        transform: scale(0.05) translateY(0) translateX(0) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    70% {
        opacity: 1;
    }
    100% {
        transform: scale(0.5) translateY(var(--movAmtY)) translateX(var(--movAmtX)) rotate(360deg);
        opacity: 0;
    }
}