*   {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

html    {
    margin: 0;
    padding: 0;
}

body    {
    margin: 0;
    padding: 0;
    width: 100%;
}

#div1, #div2 {
    display: none;
    background-color: purple;
    width: 50%;
    min-height: 200px;
    margin: 20px auto;
    padding: 20px;
    margin-left: 100px;
    font-size: 150px;
    color: white;
}

#div2{
    background-color: black;
}


#button1, #button2 {
    display: block;
    margin: 10px auto;
    padding: 10px 20px;
    background-color:  aqua;
    color: black;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-right: 100px;
}


#button1:hover{
    background-color:  lightcoral;
}

#button2:hover{
    background-color:  lightcoral;
}

#button3, #button4{
    display: block;
    margin: 10px auto;
    padding: 10px 20px;
    background-color: lightcoral;
    color: black;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-right: 90px;
}

#button3:hover{
    background-color: aqua;
}

#button4:hover{
    background-color: aqua;
}