style.css

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    

}
body{
    width: 100%;
    height:100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(45deg,#0a0a0a,#3a4452);
}
.calculator{
    border: 1px solid #717377;
    padding: 20px;
    border-radius:16px;
    background: transparent;
    box-shadow: 0px 3px 15px   rgba(113,115,119,0.5) ;

}

input{
     width: 320px;
    border: none;
    padding: 24px;
    margin: 10px;
    background: transparent;
    box-shadow: 0px 3px 15px rgbs(84,84,84,0.1);
    font-size: 40px;
    text-align: right;
    color: #b94469;
}

input::placeholder{
     color: #ffffff;
}
button{
     border:none;
     width:60px;
     height: 60px;
     margin: 10px;
     border-radius: 50%;
     background: transparent;
     color: #ffffff;
     font-size: 20px;
     box-shadow: -8px  -8px  15px  rgb(255,255,255,0.1);
     cursor: pointer;

}    
.equalBtn{
     background-color: #183796;
}

.operator{
    color: #6dee0a;
}