*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}
body{
    background-color: rgba(0, 0, 0, 0.892);
    display: flex;
    height: 100vh;
    justify-content: center;
    align-content: center;
    align-items: center;
}
#output{
    background-color: #f0f0f0;
    height: 90px;
    padding: 20px;
    font-size: 20px;
    display: flex;
    align-items: center;
    font-weight: 600;
}
button{
    padding: 30px;
    width: 50px;
    font-size: 20px;
    font-weight: 600;
    display: flex;
    justify-content: center;
    align-items: center;
}
button:hover{
    cursor: pointer;
}
.numbers{
    gap:0;
    padding: 0;
}
.calculator{
    border: 2px solid #fffefe;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
}
#firstRow , #secondRow,#thirdRow,#fourthRow{
    display: flex;
}