main {
    width: 80%;
    margin: 0 auto;
}

.small {
    margin: 20px 0 0;
    display: flex;
    justify-content: center;
}

.small > div {
    width: 30%;
    min-height: auto;
    padding: 30px;
    margin: 30px;
    border: 2px solid red;
    border-radius: 40%;
    background-color: red;
    background-color: whitesmoke;
}

.big {
    background-color: aqua;
}

.big > img {
    width: 100%;
}