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

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

#page1 {
    height: 100vh;
    width: 100%;
    background-color: rgb(80, 202, 224);
    display: flex;
    align-items: center;
    justify-content: center;
}

#page2 {
    height: 100vh;
    width: 100%;
    background-color: rgb(51, 147, 164);
    display: flex;
    align-items: center;
    justify-content: center;
}

#page3 {
    height: 100vh;
    width: 100%;
    background-color: rgb(34, 100, 112);
    display: flex;
    align-items: center;
    justify-content: center;
}

#box {
    height: 200px;
    width: 200px;
    background-color: red;
}