* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    width: 100vw;
}
#allbody {
    width: 400px;
    margin: 80px auto;
    border: 10px solid black;
}
.calculator {
    display: flex;
    flex-direction: column;
}
.calculator .displayer {
    border: 5px solid #e59a18;
    height: 100px;
    background-color: black;
    color: white;
    font-size: 45px;
    padding-top: 45px;
    padding-left: 5px;
}
.calcelem {
    margin: 15px;
    display: grid ;
    grid-template-columns: auto auto auto auto;
}
.calculator #off {
    margin-top: 10px;
    width: 30px;
    margin-left: 25px;
    background-color: #e59a18;
    color: white;
}
#but {
    display: flex;
    justify-content: space-between;
}
#but .brackets {
    margin-top: 10px;
    margin-right: 25px;
    
}
[id^='bra'] {
    background-color: black;
    width: 32px;
    color: white;
}
.calcelem button {
    
    margin: 10px;
    background-color: black;
    color: white;
    text-align: center;
    height: 50px;
    padding-top: 5px;
    font-size: 20px;
    font-weight: bold;
}
.calcelem #zero {
    grid-column: span 2;
}
.calcelem .ev {
    background-color: #e59a18;
}