*{
   margin:0%;
   padding:0%;
   box_sizing: border-box;
}
html,body{
   height: 100%;
   width: 100%;
}
#one{height: 50px;
    width: 500px;
    background-color: aquamarine;
}
#two{
    background-color: rgb(209, 168, 175);
    height: 200px;
    width: 250px;
    text-align: center;
}
#three{
    background-color: yellow;
    height: 30px;
}