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

html,body{
    height: 100%;
    width: 100%;
}
body{
    background-color: #111;
}

#page1{
    height: 100%;
    width:100%;
    background-color: lightblue;
    display: flex;
    align-items: center;
    justify-content: center;
}
#page2{
    height: 100%;
    width:100%;
    background-color: rgb(99, 199, 233);
    display: flex;
    align-items: center;
    justify-content: center;
}
#page3{
    height: 100%;
    width:100%;
    background-color: rgb(27, 181, 233);
    display: flex;
    align-items: center;
    justify-content: center;
}

#box{
    height: 300px;
    width: 300px;
    background-color: crimson;
}