Style.css

.container{
    display:grid;
    grid-template-columns: 25% 25% 25% 25%;
    grid-template-rows: 25% 25% 25% 25%;
    column-gap: 2px;
    max-width: 350px;
    margin-top: 10px;
    margin-left:20px;
}
body{
    margin:0;
    padding:0;
    background-color: rgba(235, 233, 233, 0.863);
}

.title{
    width:300px;
    
    text-align: center;
    margin-top: 30px;
    margin-left: 28em;
    font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    font-size: larger;
    color: gray;
    text-shadow: 2px 2px 5px ;
}
.tile {
    border: 1px solid rgb(197, 191, 191);
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    cursor: pointer;
    margin:2px;  
    color:rgb(112, 111, 111);
}

.Display-panel{
    display: block;
    width:340px;
    height: 80px;
    margin-left:20px;
    border: 1px solid rgb(197, 191, 191);
    
    padding: 5px;
}

.expression{
    display:block;
    width:340px;
    height:50%;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    color: rgb(59, 58, 58);
}
.result{
    width:100px;
    height:20px;
    margin-top: 10px;
    margin-left:240px;
    text-align:right;
    font-size: larger;
    font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    color: rgb(92, 91, 91);   
    font-weight: bold;
}

.Calculator{
    border : 1px solid lightgray;
    box-shadow: 12px 12px 12px 12px 12px darkgray;
    width:400px;
    margin-top: 20px;
    margin-left: 30em;
    padding: 10px;
}

.num:hover{
    background-color: rgba(221, 220, 220, 0.87);
}

.operator:hover{
    background-color: rgba(221, 220, 220, 0.87);
}

.egale{
    background-color: rgba(32, 32, 245, 0.815);
    color:whitesmoke;
}

.clear{
    background-color: rgb(245, 58, 58);
    color:whitesmoke
}