body {
    width: 960px;
    margin: 2em auto;
    font-family: Arial, sans-serif;
    font-size: 16px;
    line-height: 1.4;
}

h1 {
    font-size: 2em;
    font-weight: normal;
    margin: 0 0 1rem 0;
}
section {
    padding: 2rem;
    border: 1px solid #ccc;
    margin: 4rem 0;
    background-color: #fff;
}

aside {
    font-size: 24px;
    font-family: Georgia, Serif;
    font-style: italic;
    background-color: #aaa;
    color: #fff;
    padding: 1.5rem;
    width: 15rem;
}

.one {
    float: right;
}

.two {
    position: absolute;
    top: 840px;
    right: 350px;
    
}

.three {
    position: fixed;
    background-color: green;
    top: 0;
    right: 0;
}

.parent {
    position: relative;
}
.fourRed {
    position: absolute;
    background-color: red;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    
}

.fourBlack {
    position: absolute;
    background-color: black;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin-top: 10px;
    margin-left: 10px;
    z-index: 1;
   

}