#output{
    grid-column: 1 / 4;
}
*{
    margin: 0;
    padding: 0;
    border: none;
    outline: none;
    font-family: 'Comfortaa', cursive;
    font-size: 1.1em;
}
body{
    display: flex;
    align-items: center;
    justify-content: center;
}
main{
    display: grid;
    width: 30%;
    height: 70%;
    box-shadow: 0 0 3px;
    grid-template-columns: repeat(3,1fr);
}
#input{
    padding: 0 3%;
    grid-column: 1/3;
}
.number{
    background-color: #0af;
}
button,input:hover,input:focus{
    transition: box-shadow .5s;
}
button:hover,input:hover,input:focus{
    box-shadow: 0 0 3px;
    z-index: 2;
}
#total{
    background-color: #f70;
}