*,
*::after,
*::before {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box
}

body {
    font-family: Arial, Verdana, sans-serif
}

.container .block {
    min-height: 200px;
    min-width: 200px;
    max-width: 300px;
    color: white;
    padding: 0.5em;
    background-color: #333;
    border: 0.1em solid #DDD;
    position: absolute;
    z-index: -1;
}

.container .block h2 {
    margin: 0;
    font-weight: normal
}

.container .block.small {
    min-height: auto;
    min-width: auto;
    width: 100px;
    height: 100px;
    position: absolute;
    right: 0;
    bottom: 0;
}

.container .bg-blue {
    background-color: blue;
    position: relative;
    z-index: 1;
}

.container .bg-green {
    background-color: green;
}

.container .bg-purple {
    background-color: purple;
    position: fixed;
    top: 0;
    left: 0;
    z-index: -2;
    
}