body {
    font-size: 40px;
}

* {
    box-sizing: border-box;
}

.block {
    background: #d8f9ff;
}

.block {
    padding: 30px;
    margin: 50px;
}

/* ====================================================== */

.block {

    width: 3000px;
    height: 900px;
    overflow: auto;
    box-sizing: border-box;
}

.kurasa {
    background-color: rgb(219, 222, 188);
    box-sizing: border-box;
    border-radius: 30px;
    border-style: ridge;
    border-color: black, seashell;
    border-width: 5px;
    padding-left: 50px;
    padding-right: 50px;
    padding-bottom: 50px;
    display: inline-block;
    width: 550px;
    min-width: 300px;
    max-width: 550px;
    min-height: 100px;
    max-height: 450px;
    box-shadow: inset 0px 0px 30px 0px;
    margin: 20px;
}