:root {
    --bg-main: #e9e9e9;
    --color-box: #2c82c9;
    --color-accent: #c0392b;
    --txt-main: #222;
    --size-box: 125px;
    --header-size: 24px;
    --footer-size: 22px;
}

body {
    font-family: Arial, sans-serif;
    background: var(--bg-main);
    color: var(--txt-main);
    margin: 0;
}

header {
    font-size: var(--header-size);
    background: var(--color-accent);
    color: white;
    text-align: center;
    padding: 15px 0;
}

main {
    margin-top: 60px;
    padding: 20px;
    width: 90%;
    max-width: 950px;
    margin-inline: auto;
}

section {
    background: #fff;
    padding: 22px;
    border-radius: 10px;
    margin-bottom: 45px;
    box-shadow: 0 3px 6px rgba(0,0,0,0.12);
}

.box {
    width: var(--size-box);
    height: var(--size-box);
    background: var(--color-box);
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-weight: bold;
    border-radius: 10px;
}




.static-demo {
    position: static;
}


.relative-demo {
    position: relative;
    left: 150px;
    top: 30px;
}


.abs-container {
    position: relative; 
    height: 250px;
}

.absolute-demo {
    position: absolute;
    bottom: 15px;
    left: 20px;
}


.sticky-demo {
    position: sticky;
    top: 60px;
}


footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    text-align: center;
    background: var(--color-accent);
    color: #fff;
    padding: 12px 0;
    font-size: var(--footer-size);
}