* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    min-height: 100vh;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    background: url('img/พื้นหลัง.png') no-repeat center center fixed;
    background-size: cover;
}