*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html{
    font-family: Montserrat;
}
section{
    background-color: rgb(77, 147, 211);
    width: 100%;
    height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}
.box{
    width: 90%;
    max-width: 400px;
    background-color: rgb(5, 110, 42);
    border-radius: 6px;
    overflow: hidden;
}
#display{
    background-color: antiquewhite;
    width: 100%;
    height: 100px;
    text-align: right;
    font-size: 30px;
    padding: 20px;
    position: relative;
}
.all-buttons{
    display: grid;
    grid-template-rows: repeat(4,1fr);
    grid-template-columns: repeat(4,1fr);
    cursor: pointer;
}
.button{
    border: 0.5px solid ;
    height: 100px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
}
.button:hover{
    background-color: rgb(253, 149, 4);
}
.btn-0{
    grid-column: 1/3
}