*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
    letter-spacing: 1px;

}
body{
    background: linear-gradient(45deg,#0a0a0a,#3a4452);
    min-height: 100vh;
    max-width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    /*
    display:grid;
    place-item:center;
    */  
}
.claculator{
    padding: 15px;
    box-shadow: 0 0 50px #000;
    border: 2px solid rgb(140, 135, 135);
    border-radius: 20px;

}
.display input{
    width: 300px;
    border: none;
    outline: none;
    background: transparent;
    padding: 20px;
    margin: 10px;
    color: #fff;
    font-size: 40px;
    text-align: right;
    cursor: pointer;
    box-shadow: -5px -5px 5px black;
    border-radius: 50px;
}
input::placeholder{
    color: #fff;
}

button{
    width: 70px;
    height: 70px;
    background: transparent;
    margin: 5px;
    color: #fff;
    font-size: 25px;
    font-weight: 600;
    border-radius: 50px;
    box-shadow:-6px -5px 10px #000;
    outline: 1px solid #313131;
    outline-offset:3px ;
    cursor: pointer;
}
button:active{
    background: whitesmoke;
    color: black;
    transform: translate(-5px,-5px);
}
.opr{
    color: #fbff00;
    background: #1e1919;
    font-family: 900;
}
#eqBtn{
    background: orangered;
    font-weight: 900;
    width: 70px;
    height: 80px;
    border-radius: 25px;
}