body {
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, Helvetica, sans-serif;
    background: #ffffff;
    height: 100vh;
}

.Calculator {
    padding: 15px;
    border-radius: 8px;
    border: 2px solid #000000;
    box-shadow: 2px 2px 10px;
    width: 250px;
    background: #000000;
}

#calculation{
    font-size: 18px;
    padding: 5px;
    border: none;
    width: 96%;
    outline: none;
    height: 35px;
    text-align: right;
    background: #3a3a3a;
    border-radius: 3px 3px 0px 0px;
    color: #ffffff;
}

#result {
    margin-bottom: 12px;
    font-size: 20px;
    padding: 5px;
    border: none;
    outline: none;
    width: 96%;
    height: 40px;
    text-align: right;
    background: #3a3a3a;
    border-radius: 0px 0px 3px 3px;
    color: #ffffff;
}

.buton {
    gap: 10px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

button {
    border-radius: 5px;
    background: #5f5f5f;
    /* color: rgb(0, 0, 0); */
    cursor: pointer;
    color: #fff;
    height: 50px;
    border: 2px solid #000000;
    font-size: 18px;
    box-shadow: 1px 1px 5px;
}

.Ans {
    background: #ffbb01;
}

.opt-color{
    background-color: #f8cf19;
}

.opt-color-u{
    background-color: #f1cb1d;
}

.opt-color-u:hover{
    background-color: #fad222;
}

.opt-color:hover{
    background-color: #f8cf19;
}

.Ans:hover {
    background-color:  #fbff00;
    color: #000;
}

.nothing {
    background: #242525;
    color: #ffffff;
}

.nothing:hover {
    background: #1a1a1a;
}

.main-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.footer {
    margin-top: 18px;
    color: #444;
    font-size: 14px;
    text-align: center;
}

.footer span {
    font-weight: bold;
    color: #000;
    font-size: large;
}