body {
    background-color: gray;
    animation-name: cycleBgColor;
    animation-direction: alternate;
    animation-duration: 10s;
    animation-iteration-count: infinite;
    margin: 0;
    padding: 0;
    border:0;
}

.ping {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    animation-name: pingFrames;
    animation-duration: 2s;
    animation-iteration-count: 1;
}

@keyframes pingFrames {
    0% {
        transform: translate(-50%, -50%) scale(0);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0;
    }
}


.bg {
    background: radial-gradient(circle, rgba(255, 255, 255, 0) 0%, rgb(98, 202, 243) 100%);
    background-attachment: fixed;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    width: 100%;
    height: 100%;
}

@keyframes cycleBgColor {
    0% {
        background-color: oldlace;
    }
    25% {
        background-color: lightblue;
    }
    50% {
        background-color: rgb(247, 215, 34);
    }
    75% {
        background-color: lightyellow;
    }
    100% {
        background-color: oldlace;
    }
}

.hello {
    font-family: 'Arial', sans-serif;
    text-align: center;
    transform: translate(-50%, -50%);
    position: absolute;
    top: 50%;
    left: 50%;
    font-size: 100px;
    overflow: visible;
}

.mutg-no {
    color: gray;
}