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

h1 {
    color: cadetblue;
    text-align: center;
    text-shadow: 3px 1px orangered;
    font-size: 50px;
}

p {
    color: cadetblue;
    text-align: center;
    font-size: 30px;
    text-shadow: 3px 1px #222;
}

body {
    background-color: slategray;
}

.left {
flex: 1 0 50%;
background-color: greenyellow;
height: 100vh;
}

.container {

    display: flex;
    flex-flow: row wrap;
    position: relative;
}

.right {
flex: 1 0 50%;
background-color: teal;
height: 100vh;
}

.block {
    background-color: deeppink;
    width: 50vw;
    height: 20vh;
    position: absolute;
    top: 2em; left: 50vw;
    transform: translateX(-50%);
}