body{
    margin: 0;
    display:flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: hsl(0, 0%, 0%);
}
#calculator{
    font-family: "Bricolage Grotesque", sans-serif;
    background-color: hsl(0, 0%, 5%);
    border-radius: 35px;
    max-width: 500px;
    overflow: hidden;
    box-shadow: 0.1px 0.1px 200px 2px rgba(255, 149, 0, 0.301);
}
#display{
    width: 100%;
    padding: 20px;
    font-size: 5rem;
    text-align: left;
    border: none;
    background-color: hsl(0, 0%, 12%);
    color: white;   
}
#keys{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    padding: 25px;
}
button {
    width: 100px;
    height: 100px;
    aspect-ratio: 1 / 1;
    border-radius: 25px;
    border: none;
    background-color: hsl(0, 0%, 23%);
    color: white;
    font-size: 3rem;
    font-weight: bold;
    cursor: pointer;
    box-shadow: inset 0 0 0 rgb(255, 255, 255);
    transform: scale(1);
    transition: box-shadow 0.2s ease-in-out, transform 0.2s ease-out; 
}

button:hover {
    background-color: hsl(0, 0%, 40%);
    box-shadow: inset 0.1px 0.1px 10px 2px rgb(255, 255, 255);
    transform: scale(1.1);
}
button:active{
    background-color: hsl(0, 0%, 50%);
}
.operator-btn{
    background-color: hsl(30, 100%, 50%);
}
.operator-btn:hover{
    background-color: hsl(30, 100%, 65%);
    box-shadow: inset 0.1px 0.1px 10px 2px rgb(255, 255, 255);
}
.operator-btn:active{
    background-color: hsl(30, 100%, 75%);
}
.calculate-btn{
    box-shadow: inset 0 0 0 hsl(30, 100%, 50%);
}
.calculate-btn:hover{
    box-shadow: inset 0.1px 0.1px 10px 2px hsl(30, 100%, 50%);
    color: orange;
}