:root {
    --wave-width: 10px;
    --wave-gap: 8px;
}

* {
    margin: 0;
    padding: 0;
}

body {
    width: 100vw;
    height: 100vh;
    background-color: rgb(0, 0, 39);
}

#page {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 30px;
}

#page_header {
    font-family: sans-serif;
    font-size: 40pt;
    color: white;
}

.demo {
    width: 100%;
    height: 25%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--wave-gap);
    background-color: navy;
    box-shadow: 0px 0px 10px -3px white;
}

.demo_A_wave {
    background-color: rgb(37, 255, 85);
}

.demo_B_wave {
    background-color: rgb(243, 207, 0);
}


.wave {
    width: var(--wave-width);
    height: 0;
    border-radius: var(--wave-width);
    transition: height 0.5s;
}


button {
    padding: 10px;
    font-family: sans-serif;
    font-size: 20pt;
    background-color: aqua;
}
button:hover {
    background-color: rgb(4, 189, 189);
}