body {
    font-family: Arial, sans-serif;
    margin: 20px;
}
#tip-calculator{
    max-width: 450px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-shadow:0 0 10px rgba(0,0,0,0.1);
}
#tip-calculator h1 {
    text-align: center;
    color: #333;
}
#tip-calculator label {
    font-weight: bold;
}
#tip-calculator input{
    width:100%;
    padding:8px;
    margin:8px 0;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 5px;
}
#tip-calculator button {
    width: 100%;
    padding: 10px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
}