.display-screen
{
    border: 5px black solid;
    height: 730px;
    width: 1100px;
    display: grid;
    align-items: center;
    justify-items: center;
    color: white;
    background-color: white;
}
.display-screen-b
{
    background-color: black;
    border: 5px solid white;
}
#stop
{
    border: 0px;
    border-radius: 5px;
    background-color: red;
    color: black;
    padding: 10px 30px;
}
#stop:hover
{
    background-color: maroon;
    cursor: pointer;
}
#start
{
    border: 0px;
    border-radius: 5px;
    background-color: lime;
    color: black;
    padding: 10px 30px;
}
#start:hover
{
    background-color: green;
    cursor: pointer;
}
#back
{
    border: 0px;
    border-radius: 5px;
    background-color: lightblue;
    color: black;
    padding: 10px 30px;
}
#back:hover
{
    background-color: blue;
    cursor: pointer;
}