/* General Reset */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

/* Body styling */
body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    background-color: #f5f5f5;
    padding: 40px 20px;
}

/* Headings */
h1 {
    margin-bottom: 30px;
    text-align: center;
    color: #333;
}

/* Buttons */
button {
    padding: 10px 20px;
    margin: 10px;
    font-size: 18px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    background-color: #4CAF50;
    color: white;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #45a049;
}

/* Calculator Container */
.calculator {
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    max-width: 300px;
    width: 100%;
}

/* Display */
.display {
    width: 100%;
    height: 50px;
    margin-bottom: 15px;
    font-size: 24px;
    text-align: right;
    padding: 5px 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #eee;
}

/* Calculator Buttons Grid */
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

/* Tip Calculator Inputs */
.input-group {
    margin-bottom: 15px;
    width: 100%;
}

input[type="number"] {
    width: 100%;
    padding: 8px 10px;
    font-size: 16px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

/* Tip Results */
#tip-result {
    margin-top: 15px;
    font-size: 18px;
    font-weight: bold;
}