cal.css

body{
    height: 100vh;
    background: violet;
    display: flex;
    justify-content: center;
    align-items: center !important;
}
 .change {
  height: 20px;
  width: 20px;
  border-radius: 20px;
  background: #000 !important;
 position: absolute;
  right: 6px;
}
.top {
    height: 60px;
    width: auto;
    background: rgb(232, 220, 220) !important;
    margin: 20px;
    color: black !important;
    display: flex;
    align-items: flex-end;
    justify-content: end;
}
.calculator {
    padding: 10px;
    background: white;
    position: relative;
    border-radius: 5%;
    box-shadow: 0 0 30px black;
}
button{
    height: 40px;
    width: 40px;
    border-radius: 50%;
    border: none;
}
#equal {
    height: 80px;
}
button:hover{
    transform: scale(.9);
}
               /* light theme */
.calculator button#clear{
    color: darkorchid;
    background: rgb(136, 109, 90);
}
.calculator button.btn-number{
    background: rgb(150, 92, 5);
    color: black;
}
.calculator button.btn-operator{
    background: rgb(26, 161, 148);
    color: rgb(28, 91, 209);
}

           
               /* Dark theme */

               .change.dark{
                background: white;
              }
              
              .calculator.dark{
                  background: black;
                  box-shadow: 0 0 30px white;
              }
            


.calculator.dark button#clear{
    color: brown;
    background: rgb(72, 3, 17);
}
.calculator.dark button.btn-number{
    background: darkslategrey;
    color: white;
}
.calculator.dark button.btn-operator{
    background: rgb(76, 70, 8);
    color: yellow;
}

.calculator.dark .change{
    background: #fff !important;
}

.calculator.dark .top{
    background:rgb(74, 73, 73) !important; 
    color: white !important;
}