* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: cursive;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #edf1f4;
}

.dark{
    background-color: #282c2f;
}
.container {
    position: relative;
    min-width: 450px;
    padding: 20px;
    border-radius: 20px;
    box-shadow: 15px 15px 20px rgba(0, 0, 0, 0.1), -15px -15px 20px #fffb;
}

.dark .container{
    background-color: #33393e;
    box-shadow: 15px 15px 20px rgba(0, 0, 0, 0.25), -15px -15px 20px rgba(0,0,0,0.25);

}
.container .calculator {
    position: relative;
    display: grid;
}

.container .calculator .value {
    position: relative;
    grid-column: span 4;
    user-select: none;
    overflow: none;
    width: 100%;
    height: 100px;
    text-align: end;
    color: #5166d6;
    line-height: 100px;
    box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.3), inset -5px -5px 10px #fff;
    border-radius: 15px;
    margin-bottom: 10px;
    padding: 0 20px;
    font-size: 2em;
    font-weight: bold;
    
}

.dark .calculator .value{
    background-color: #33393e;
    color: #eee;
    box-shadow: inset 15px 15px 20px rgba(0, 0, 0, 0.5),inset -15px -15px 20px rgba(0,0,0,0.25);
}

.container .calculator span {
    position: relative;
    padding: 12px;
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1), -5px -5px 10px #fff;
    margin: 10px;
    cursor: pointer;
    user-select: none;
    min-width: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25em;
    color: #222121;
    border: 2px solid #edf1f4;
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1), -5px -5px 10px #fff;
    border-radius: 15px;
}


.dark .calculator span{
    color: #eee;
    border: 2px solid #4e4e4e;
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.25), -5px -5px 10px rgba(255, 255, 225, 0.1);
}

.container .calculator span:active {
    box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.1), inset -5px 5px 10px #fff;
    color: #f44336;
}

.dark .calculator span:active{
    box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.25), inset -5px -5px 10px rgba(255, 255, 225, 0.1);
}

.container .calculator span#on {
    background-color: #f13123;
    color: #fff;
    border: 2px solid #edf1f4;
    grid-column: span 2;
}

.container .calculator span#equal {
    color: #fff;
    border: 2px solid #edf1f4;
    grid-row: span 2;
    background-color: #3621f3;
}

.container .calculator span#modify{
    background-color: #07a8ad;
    color: #fff;
    border: 2px solid #edf1f4;
}
.container .calculator span#on:active,
.container .calculator span#equal:active,
.container .calculator span#modify:active {
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1),
        -5px -5px 10px #fff,
        inset 5px 5px 10px rgba(0, 0, 0, 0.1);
}


.dark .calculator span#on,
.dark .calculator span#equal,
.dark .calculator span#modify{
    border: 2px solid #bebaba;
}


.dark .calculator span#on:active,
.dark .calculator span#equal:active,
.dark .calculator span#modify:active{
   box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1);
}


@media (max-width: 425px) 
{
.container{
    min-width: 320px;
}

.container .calculator .value{
    height: 60px;
    line-height: 60px;
    font-size: 1.5em;
}
.container .calculator span{
    min-width: 55px;
    font-size: 1em;
    margin: 4px;
    padding: 9px;
    border-radius: 8px;
}
}

@media (min-width: 1550px) {
    .container{
        min-width: 600px;
    }
    
    .container .calculator .value{
        height: 130px;
        line-height: 130px;
        font-size: 3em;
    }
    .container .calculator span{
        min-width: 150px;
        font-size: 2.5em;
        margin: 15px;
        padding: 20px;
    }
}


@media (min-width: 1850px) {
    .container{
        min-width: 800px;
    }
    
    .container .calculator .value{
        height: 200px;
        line-height: 200px;
        font-size: 5em;

    }
    .container .calculator span{
        min-width: 250px;
        font-size: 3em;
        margin: 25px;
        padding: 30px;
    }
}