1bit.pw/sass/_layout.scss

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

html, body {
    width: 100%;
    height: 100%;   
}

.container {
    width: 100%;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
    padding-bottom: 2rem;
}