.kvadrat {
    background: rgb(207, 149, 149);
    width: 250px;
    height: 200px;
    display: inline-block;
    margin: 10px;
    border: 1px solid #000;
    border-radius: 30px;
    box-shadow: inset 0 0 15px red;
}
h2,
p {
    padding: 10px 20px;
}

.block {
    box-sizing: border-box;
    height: 500px;
    overflow: auto;
    background: rgb(223, 193, 193);
    border: 1px solid #000;
    border-radius: 30px 0 0 30px;
}