calculator.css

.calculator{
    width:27%;
    margin: auto;
    height: 410px;
    margin-top: 100px;
    border-radius: 10px;
}
.expression{
    width: 100%;
}
.expression input{
    width: 100%;
    padding: 30px 10px 10px 10px;
    font-size: 24px;
    font-size-adjust: 0.58;
    text-align: right;
    border-radius: 5px;
    background-color: white;
    letter-spacing: 6px;
    border-color:rgb(95, 95, 163);
}
.functions{
    width:100%;
    height: 80%;
}
.functions table{
    width:100%;
    height:100%;
    border-collapse: collapse;
}
td button{
    text-align: center;
    font-size: 23px;
    color: black;
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    border: 1px solid rgb(68, 176, 238);
    background-color: white;
    border-radius: 5px; 
}
.btn-primary{
    text-align: center;
    font-size: 23px;
    color: white;
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    border: 1px solid black;
    background-color:hsl(211deg 100% 50%);;
    border-radius: 5px; 
}
.btn:hover{
    background-color: black;
    color: white;
    border:2px solid tomato;
}