.muzieknootjes {
    display: block;
    margin: auto;
    position: relative;
    width: 50%;
    min-width: 300px;
    height: 200px;
    border: 0px solid #000;
}

.noot-1,
.noot-2,
.noot-3,
.noot-4 {
    position: absolute;
    animation: notes 2s infinite linear;
    font-size: 35px;
    opacity: 0;
}

.noot-1 {
    top: 60px;
    left: 0;
    animation-delay: 0.5s;
}

.noot-2 {
    top: 30px;
    left: 30%;
    animation-delay: 1s;
}

.noot-3 {
    top: 90px;
    left: 60%;
    animation-delay: 1.5s;
}

.noot-4 {
    top: 40px;
    left: 90%;
    animation-delay: 2s;
}

@keyframes notes {
    0% {
        transform: scale(1) translate(0, 0);
        opacity: 0;
    }

    50% {
        opacity: 1;
        transform: scale(1.5) translate(50%, -50%);
    }

    80% {
        opacity: 0;
        transform: scale(1.5) translate(100%, -100%);
    }

    100% {
        transform: scale(1.5) translate(100%, -100%);
        opacity: 0;
    }
}