* {
    box-sizing: border-box;
}

html {
    font-family: "Jost", sans-serif;
}

body {
    margin: 0;
}

header {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);
    margin: 3rem;
    border-radius: 10px;
    padding: 1rem;
    background-color: #4fc08d;
    color: white;
    text-align: center;
}

#styling {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);
    margin: 3rem;
    border-radius: 10px;
    padding: 1rem;
    text-align: center;
}

.demo {
    width: calc(100% - 32px);
    height: 100px;
    margin: 16px;
    border: 2px dashed #ccc;
}

.active {
    border-color: red;
    background-color: salmon;
}