app.css

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

body {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(45deg, #2a1d1d, #1f2732);

}
.calculator{
    
    border: 1px solid #717377;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0px 3px 15px rgba(113,115,119,0.8);
    padding-top: 40px;

}

#input {
    text-align: right;
    width: 310px;
    height: 60px;
    background: transparent;
    margin-bottom: 10px;
    box-shadow: 0px 3px 15px rgba(113,115,119,0.8);
    border-radius: 5px;
    cursor: pointer;
    color: white;
    font-size: xx-large;
    border: none;
    outline: none;


}
#input::placeholder{
    color:white;
    font-size: xx-large;
}


button {
    width: 60px;
    height: 60px;
    margin: 8px;
    border-radius: 50%;
    cursor: pointer;
    background: transparent;
    border: none;
    color: white;
    font-size: x-large;
    box-shadow: -8px -8px 15px rgba(113,115,119,0.5);


}
.op{
    color: rgb(153, 255, 0);
}
.equal{
    background-color: orange;
}