main {
    height: 100%;
}

#main1 {
    height:100%;
    width: 100%;
}

p {
    width: 20cm;
    margin-left: auto;
    margin-right: auto;
    padding-top: 5cm;
    font-size: large;
}

body {
    width: 100%;
    height: 100%;
}

html {
    height: 100%;
}