* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    overflow-y: auto;
    height: 95%;
    max-height: 700px;
    width: 95%;
    max-width: 500px;
    box-shadow: 0 0 25px 0 rgba(100, 100, 100, 0.4);
    padding: 25px;
}