body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
}

header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem;
}

.container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    margin: 20px;
}

.problem-form {
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

textarea {
    width: 100%;
    height: 100px;
    margin-top: 10px;
    resize: vertical;
}

button {
    background-color: #4caf50;
    color: white;
    border: none;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin-top: 10px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s;
}

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

.solutions {
    margin-left: 20px;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    background-color: #fff;
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}