html {
    background-color: black;
}
.container {
    display: flex;
    justify-content:center;
    flex-wrap: wrap;

}
.container .element {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    margin: 10px;
    justify-content: center;
    mix-blend-mode: difference;
    position: relative;
}
img {
    max-width: 300px;
    max-height: 300px;
    min-width: 300px;
    min-height: 300px;
    overflow: hidden;
    border-radius: 50%;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
}