* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    width: 100%;
    background-color: #ececec;
}

header {
    width: 100%;
    background-color: lightskyblue;
}

header .contents {
    max-width: 1080px;
    min-width: 320px;
    padding: 20px;
    margin: 0 auto;
}

header .contents a {
    display: inline-block;
    width: fit-content;
    height: 24px;
    padding: 0 8px;
    color: #fafafa;
    background-color: blue;
    border-radius: 4px;
}

main {
    max-width: 1080px;
    min-width: 320px;
    padding: 20px;
    margin: 0 auto;
    background-color: #fafafa;
}

section {
    max-width: 1080px;
    min-width: 320px;
    padding: 20px;
    margin: 0 auto;
}

section img {
    width: 400px;
    margin: 20px auto;
    background-color: #fff;
    box-shadow: 0px 0px 4px #42424242;
}

footer {
    width: 100%;
    height: 30px;
    background-color: lightskyblue;
    display: flex;
    justify-content: center;
    align-items: center;
}

@media (max-width: 425px) {
    section img {
        width: 300px;
    }
}