* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
}

.square {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin: 0 auto;
    max-width: 90%;
    padding: 5px;
    height: 200px;
    border: 2px solid rgba(170, 170, 170, 0.712);
}

.circle {
    width: 100px;
    height: 100px;
    clip-path: circle();
    background-color: #ff0000;
}

.square__in {
    width: 100px;
    height: 100px;
    background-color: #0f4101;
}

@media screen and (min-width:728px) {
    .square {
        width: 50%;
        max-width: 100%;
    }
}