style.css

*{
    margin:0px;
    padding:0px;
    box-sizing: border-box;
    /* border: red solid 1px; */
}
body{
    display: flex;
    justify-content: center;
}
.container{
    
    display: flex;
    flex-direction: column;
    width:25%;
    padding:2px 5px;
    background-color: black;
    border-radius: 10px;
    

}
.dashboard{
    background-color: black;
    width:100%;
    height:25vh;
}
.calculator{
    padding: 1rem;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr 1fr 1fr;
    border:1px solid black;
    height:50%;
    text-align: center;
    grid-gap: 4px;
    
    
    
}

.pn,.back,.AC{
    color:black;
    background-color: grey;
    border:none

}
button{
    font-family: Arial, Helvetica, sans-serif;
    font-size: 2rem;
    font-weight: bolder;
    width:90%;
    height:9vh;
    border-radius: 40%;
    text-align: center;
    
}
.divide{
    font-family: Arial, Helvetica, sans-serif;
    font-size: 2rem;
    font-weight: bolder;
    width:90%;
    height:9vh;
    border-radius: 40%;
    text-align: center;
    vertical-align: center;
}
.zero{   background-color:rgb(87, 85, 85);
    color:white;
    border:none;
    border-radius: 15px;
}
.divzero{
    width: 100%;
    grid-column: 1/3;
    grid-row: 5/6;
}
.minus,.plus,.equal,.divide,.times{
    color:white;
    background-color: darkorange;
    border:none;
}

.number,.point{
    background-color:rgb(87, 85, 85);
    color:white;
    border:none;
}
.firstdashboard,.seconddashboard{
    color:white;
    text-align: right;
    width:100%;
    height:12vh;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: end;
}
.firstdashboard{
    font-size:1.2rem;
}
@media screen and (max-width:1200px){
    .container{width:40% ;}
}
@media screen and (max-width:650px){
    .container{width:60% ;}
}
@media screen and (max-width:411px){
    .container{width:100% ;}
}