.btn{
    width: 46px;
    height: 50px;
    margin: 1px;
    
    
}
.erl{
    width: 150px;
}
.calculator{
    animation-name: shad;
    animation-duration: 2s;
    animation-iteration-count: infinite;
}



@keyframes shad{
    0%{
        border: 5px solid red;
    }
    20%{
        border: 5px solid rgb(76, 1, 87);
    }
    40%{
        border: 5px solid rgb(9, 93, 34);
    }
    60%{
        border: 5px solid rgb(1, 130, 128);
    }
    80%{
        border: 5px solid rgb(43, 0, 255);
    }
    100%{
        border: 5px solid rgb(174, 0, 124);
    }
   


}