* {
    box-sizing: border-box;
}


body {
    font-family: Arial, sans-serif;
    text-align: center;
}


.container {
    display: flex;
    gap: 10px;
    padding: 20px;
    justify-content: center;
}
.box {
    padding: 20px;
    background-color: white;
    border: 2px solid black;
}
a {
    display: block;
    margin: 20px auto;
    text-decoration: none;
    font-weight: bold;
    padding: 10px;
    width: 200px;
    border-radius: 5px;
    text-align: center;
}
.flex-grow-page {
    background-color: lightblue;
}
.flex-grow .box {
    flex-grow: 1;
    border-color: darkblue;
}
.flex-grow a {
    background-color: darkblue;
    color: white;
}
.flex-shrink-page {
    background-color: lightcoral;
}
.flex-shrink .box {
    flex-shrink: 1;
    width: 300px;
    border-color: darkred;
}
.flex-shrink a {
    background-color: darkred;
    color: white;
}