*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "poppins", sans-serif;
}
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: 1rem;
    background: transparent;
}
.display{
    margin: 10px;
}
input{
    width: 355px;
    border: none;
    color: #fff;
    outline: none;
    padding: 24px;
    font-size: 2.5rem;
    text-align: right;
    background: transparent;
    box-shadow: 0 3px 15px rgba(84, 84, 84, 0.4);
    cursor: pointer;
}
input::placeholder{
    color: #fff;
}
button{
    border: none;
    outline: none;
    width: 70px;
    height: 60px;
    margin: 10px;
    border-radius: 0.6rem;
    font-size: 1.5rem;
    cursor: pointer;
}
button:active{
    transform: translate(2px,2px);
}
.btn-eq{
    width: 160px;
    color: #fff;
    font-weight: 600;
    background-color: rgba(255, 166, 0, 0.873);
}
.btn-op,.btn-fn{
    color: orange;
    font-weight: 600
}
.btn-num{
    font-weight: 600
}





/* media Queries  */

 @media (max-width:480px) {
    .calculator{
      padding: 10px;
    }
    input{
      width: 305px;
      padding: 25px;
      font-size: 1.8rem;
    }
    button{
        width: 65px;
        height: 50px;
        border-radius: 5px;
        margin: 6px;
        font-size: 1.3rem;
    }
    .btn-eq{
      width: 145px;
    }
} 


@media (max-width:360px) {
    .calculator{
      padding: 10px;
    }
    input{
      width: 262px;
      padding: 25px;
      font-size: 1.8rem;
    }
    button{
        width: 54px;
        height: 40px;
        border-radius: 5px;
        margin: 6px;
       font-size: 1.3rem;
    }
    .btn-eq{
      width: 124px;
    }
}