*{
    box-sizing: border-box;
}
.calc{
    color:white;
    background-color: black;
    width:400px;

}
.body{
    margin: 0;
    padding: 0;
}
.screen{
    text-align: right;
    font-size: 40px;
    font-family: Arial, Helvetica, sans-serif;
    font-stretch: narrower;
    padding: 20px 5px;
    
}
.calc-button{
    background-color:#d8d9db;
    width: 24.5%;
    height: 100px;
    cursor: pointer;
    border: none;
    border-radius: 0;
    font-size: 40px;
    color: black;
}
.calc-button:last-child{
    background-color:#e78a27;
    color:white;
}
.calc-button:last-child:hover{
    background-color: #94704a;
}
.calc-button:last-child:active{
    background-color: #b1690b;
}
.calc-button:hover{
    background-color: #ebebeb;
}
.calc-button:active{
    background-color: #bbbcbe;
}
.double{
    width:49.7%
}
.triple{
    width:84.8%
}
.calc-row{
    display: flex;
     align-content: stretch; 
    justify-content: space-between;
    margin-bottom: 0.5%;
}