.maindiv{
    border-width: 15px;
    border-color:#c5d3ff;
    border-radius: 15px;
    background-color: #ebebfc;
    border-style: solid;
    text-align: center;
    width: 20%;
    height: 650;
    padding-top: 20px;
    padding-bottom: 20px;
    padding-left: 20px;
    padding-right: 10px;
    margin-left: 20%;
    margin-top: 10%;
}
button {
    background-color: rgb(138, 173, 194);
    border-radius: 8px;
    height: 80px;
    width: 80px;
    margin-top: 10px;
    font-size: 34px;
}

.display{
    width: 300px;
    height: auto;
    padding-bottom: 10px;
    margin-bottom: 10px;
}
.h2{
    width: 100px;
    text-align: center;
    height: 30px;
    font-size:42px;
    padding-left: 20%;
    padding-right: 10%;
    margin-bottom: 50px;
    max-width: 150px;
}
.display_screen{
    text-align: center;
}
.first_display{
    font-size: 42px;
    width: 310px;
    height: 70px;
    padding-left: 20px;
}