style.css

#main
{
    width: 340px;
    height: 450px;
    background-color: #53022F;
    position: static;
    align-items: center;
    float: left;
    overflow: scroll;
}

.screen
{
    width:300px;
    height:70px;
    margin-left:20px;
    margin-right:20px;
    margin-bottom: 20px;
    margin-top: 20px;
    background-color:#394657;
    color: white;
    font-size: 50px;
    text-align: right;

}


.button {
    width: 45px;
    height: 45px;
    line-height: 45px;
    margin-left: 20px;
    margin-bottom: 20px;
    font-size: 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    text-align: center;
    color: white;
    background: #282f37;
}

.input
{
   color:  #2971dd;
}



.button {
    display: inline-block;
}


.equation
{
    background-color: green;
    color: white;
    width: 290px;
    height: 40px;
    line-height: 40px;
}

.clear
{
    background-color: orange;
}


.button:hover
{
    background: #2971dd;
}


.clear:hover
{
    background-color: green;
}


.button
{
    background-color: yellow;
}