body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

#loading-square {
    position: relative;
    width: 100%;
    height: 100%;
    border: 0px solid black;
}

#loading-square::after {
    content: "";
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    animation: color-change 16s linear infinite, text-change 16s linear infinite;
    font-family: monospace;
    font-size: 50px;
    color: black;
}

#loading-bar {
    position: absolute;
    height: 50px;
    width: 50px;
    z-index: 100;
    background-color: black;
    animation: load 16s linear infinite;
    border-radius: 50%;
}

@keyframes load {
    0%, 100% { top: 0; left: 0; }
    25% { top: 0; left: 100%; transform: translate(-100%, 0); }
    50% { top: 100%; left: 100%; transform: translate(-100%, -100%); }
    75% { top: 100%; left: 0; transform: translate(0, -100%); }
}

@keyframes color-change {
    0%, 100% { background-color: white; }
    25% { background-color: green; }
    50% { background-color: white; }
    75% { background-color: yellow; }
}

@keyframes text-change {
    0%, 12.5% { content: "INHALE"; }
    37.5% { content: "hold"; }
    62.5% { content: "EXHALE"; }
    87.5%, 99.9% { content: "hold"; }

}