*
{
margin: 0px;
padding:0;
box-sizing: border-box;
font-family: sans-serif;
}
body{
    display: flex;
    justify-content: center; 
    align-items: center;
    min-height: 100vh;
    background: #091921;

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

}
.calculator .value 
{
    grid-column: span 4;
    height:100px;
    text-align:right;
    border:none;
    outline: none;
    padding:10px;
    font-size:18px;

}
.calculator span {
    display:grid;
    width: 60px;
    height:60px;
    color:#fff;
    background: #0c2835;
    place-items: center;
    border: 1px solid rgba(0,0,0,.1);
}
.calculator span:active
{
    background: #000;
    color:#111;
}
.calculator span.clear
{
    grid-column: span 2;
    width:120px;
    background: #e41616;
}
.calculator span.plus
{
    grid-row: span 2;
    height: 120px;
}
.calculator span.equal
{
    background: #03b1ff;
}