body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    width: 100%;
    text-align: center;
}

h1 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #333;
}

h2 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #333;
}

.options {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
}

button {
    padding: 10px;
    background-color: #007BFF;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}

.calculadora {
    margin-top: 20px;
}

.input-group {
    margin-bottom: 15px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}

input, select {
    width: calc(100% - 22px);
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    margin-bottom: 10px;
}

#resultado-densidad, #resultado-mgToG, #resultado-cmToCm3 {
    margin-top: 20px;
    font-size: 18px;
    font-weight: bold;
    color: #333;
}