body {
    font-family: Arial, sans-serif;
    background-color: #3e3e3e;
    color: #fff;
    height: 100vh;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator {
    background-color: #2e2e2e;
    border-radius: 10px;
    padding: 20px;

}

.bmi-image {
    padding: 10px;
    outline: 2px solid #fff;
    border-radius: 10px;
}

input[type="number"], .calculate-button  {
    background-color: #3e3e3e;
    color: #fff;
}