body { 
    background-color: grey;
}

.header {
    text-align: center;
    font-family: sans-serif;
    font-size: 60px;
    color: black;
    border: 5px solid white;
    margin:10px;
}

.click_button {
    background-color: black;
    border: none;
    color: white;
    padding: 15px 30px;
    text-align: center;
    display: inline-block;
    font-size: 20px;
}

#container1{
    margin: auto !important;
    height: 700px !important; 
    width: 100% !important; 
}