body {
    font-family: cursive, sans-serif;
    background-color: #000;
    text-align: center;
    padding-top: 50px;
}

.calculator {
    background-color: #000;
    width: 400px;
    float: left;
    margin-left: 15%;
    margin-top: 20px;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 0px 50px #00ffff;
}

.calculator input[type="text"] {
    width: calc(100% - 20px);
    margin-bottom: 10px;
    padding: 10px;
    box-sizing: border-box;
    background-color: #111;
    border: none;
    color: #fff;
    border-radius: 5px;
    box-shadow: 0px 0px 20px #8a2be2;
}

.calculator button {
    width: calc(45% - 10px);
    padding: 10px;
    margin: 5px;
    border: none;
    background: linear-gradient(45deg, #111, #111);
    color: #fff;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.calculator button:hover {
    background: linear-gradient(45deg, #8a2be2, #00ffff);
    animation: neon-flashingg 1s infinite alternate;
}

@keyframes neon-flashingg {
    from {
        box-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #8a2be2, 0 0 40px #8a2be2, 0 0 70px #8a2be2, 0 0 80px #8a2be2, 0 0 100px #8a2be2, 0 0 150px #8a2be2;
    }
    to {
        box-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #00ffff, 0 0 20px #00ffff, 0 0 35px #00ffff, 0 0 40px #00ffff, 0 0 50px #00ffff, 0 0 75px #00ffff;
    }
}

#result {
    color: #fff;
}

.calculator h2 {
    color: #fff;
}