* {
    box-sizing: border-box;
}
main {
    background: #d5cece;
    padding: 15px 15px;
    border: 1px solid #000;
    border-radius: 30px 0 0 30px;
    overflow: auto;
    display: block;
}

.block {
    background: bisque;
    padding: 15px 25px;
    max-width: 200px;
    max-height: 200px;
    margin: 15px 15px;
    border: 1px solid #000;
    border-radius: 30px;
    box-shadow: 0 0 10px;
    display: inline-block;
}