*{
    padding: 0;
    margin: 0;
    font-family: sans-serif;
}
body{
    background-image: url(./back.jpg);
    background-repeat: no-repeat;

}

h1 {
    text-align: center;
    font-size: 45px;
    font-weight: bold;
    background-color: lightblue;
    font-family: sans-serif;
    margin: 30px;
    border: 2px solid red;
    border-radius: 20px;
    color: brown;
    padding: 10px;
}
span{
    border: 2px solid green;
    border-radius: 20px;
    padding: 5px;
}
sub{
    font-size: 10px;
    border: 2px solid red;
    border-radius: 20px;
    padding: 2px;

}
input{
    box-shadow: rgba(0, 0, 0, 0.95) 0px 15px 35px;
    height: 70px;
    width: 90px;
    font-size: 25px;
    font-weight: bold;
    border-radius: 10px;
    margin: 10px;
    border: none;
}
table{
    box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
    display: grid;
    width: 475px;
    margin: auto;
}
.operator{
    background-color: black;
    color: white;
}
#clear{
    background-color: red;
}
#result{
    width: 90%;
}


@media all and (min-width:100px) and (max-width:500px) {
    input{

        height: 50px;
        width: 70px;
        margin: 0px;
    }
    table{
        width: 295px;
        margin: auto;
        margin-left: 0px;
    }
    h1{
        font-size: 25px;
        text-align: left;
        margin-left: 40px;
    }
    #result{
        width: 98%;
    }
}