*{
    margin: 0;
    padding: 0;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-weight: normal;
    box-sizing: border-box;
}

body{
    margin: 0;
    padding-top: 100px;
    height: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(to right, #00AAFF, #00FF6C);
    background-repeat: no-repeat;
    background-attachment: fixed;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}



.output{
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: space-around;
    background-color: rgba(0, 0, 0, 0.699);;
    word-wrap: break-word;
    word-break: break-all;
    grid-area: 1/1/2/span 4;
    text-align: right;
    font-size: 27px;
    font-weight: bold;
    border-radius: 5px 5px 5px 5px ;
    color: #fff;
}

.currentOutput{
    font-size: 35px;
    opacity: .9;
}

.number, .operant, #clearAll, #backspace{
    opacity: 90%;
    background-color: rgba(0, 0, 0, 0.432);
    font-size: 27px;
    border-radius: 5px 5px 5px 5px;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

#equals{
    grid-area: 6/3/6/span 2;
    opacity: 90%;
    background-color: rgba(0, 0, 0, 0.432);
    font-size: 27px;
    border-radius: 5px 5px 5px 5px;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

.modulo{
    grid-area: 2/3/2/4;
}

/* Ripple effect */
button {
    background-position: center !important;
    transition: background 0.5s !important;
}
button:hover, #backspace:hover, #clearAll:hover, #equals:hover{
background: #47a7f5 radial-gradient(circle, transparent 1%, #47a7f5 1%) center/15000% !important;
}
button:active, #backspace:active, #clearAll:active, #equals:active{
background-color: #6eb9f7 !important;
background-size: 100% !important;
transition: background 0s !important;
}

button {
    border: none;
    cursor: pointer;
    color: white;
    background-color: #2196f3;
    box-shadow: 0 0 4px #999;
    outline: none;    
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

  
  /*Desktop View*/
@media (min-width: 992px) {
    .calculator-grid{    
        display: grid;
        grid-template-columns: repeat(4, 100px);
        grid-gap: 7px;
        grid-template-rows: minmax(120px, auto) repeat(5, 100px);
        justify-content: center;    
    }

    .number, .operant, #equals, #clearAll, #backspace, .previousOutput, .currentOutput{
        font-size: 27px;
    }
}

/*tablet View*/
@media (min-width: 768px) and (max-width: 991px){
    .calculator-grid{    
        display: grid;
        grid-template-columns: repeat(4, 75px);
        grid-gap: 7px;
        grid-template-rows: minmax(120px, auto) repeat(5, 75px);
        justify-content: center;    
    }

    .number, .operant, #equals, #clearAll, #backspace, .previousOutput, .currentOutput{
        font-size: 22px;
    }
}

/*Mobile View*/
@media (max-width: 767px) {
    .calculator-grid{    
        display: grid;
        grid-template-columns: repeat(4, 50px);
        grid-gap: 7px;
        grid-template-rows: minmax(100px, auto) repeat(5, 50px);
        justify-content: center;    
        margin-left: 15px;
        margin-right: 15px;
    }

    .number, .operant, #equals, #clearAll, #backspace, .previousOutput, .currentOutput{
        font-size: 20px;
    }
}