* {
    box-sizing: border-box;
}

section {
    display: inline-block;
    max-width: 300px;
    background: #b8b092;
    border-radius: 30px;
    padding: 20px;
    margin: 10px;
    box-shadow: inset 0px 0px 5px  ;
}

main {
    background: #bfdcdf;
    border-top-left-radius: 30px ; 
    border-bottom-left-radius: 30px ;
    overflow: auto;
    max-height: 500px;
}