CSS Flexbox: Make .frame take up remaining space after .square

Hello and good afternoon to anyone reading this. For a little of context, I am making my portfolio and I prefer backend rather than frontend, so I am not very good at CSS and HTML.

I know that we shouldn't apply images, but by showing an image is the best way to show the expected output that I want.

What you see in dark surrounding the table is my .frame element, the element that I want to take all the green area. I tried to make the width and height = 100%, but it still doesn't take the desired space

body {
    background-color: rgba(66, 65, 65, 0.192);
    font-family: Arial, sans-serif;
    margin: 0;
}

h1, p {
    color: rgba(0, 0, 0, 0.8);
    text-align: center;
    margin: 20px 0; /* Avoid large margins */
}

p{
    font-size: 30px;

}

.profile-photo {
    display: block;
    margin: 20px auto; /* Center image */
    width: 250px;
    height: 200px;
    border-radius: 20%;
    object-fit: cover;
    position: relative;
    z-index: 2; /* Ensure it's above the square */
}

.square {
    width: 100%;
    height: 175px;
    background-color: rgba(203, 137, 4, 0.619);
    position: relative; 
    margin-top: -150px; 
    z-index: -1;
}

.frame {
    border : black 2px solid; /*added to visualize the size of .frame*/
    flex-grow: 1;
    width: 90%;
    max-width: 100%;
    margin: 0 auto;
    background-color: white;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
}

table {
    width: 100%;
    border-collapse: collapse;
    border-radius: 20%;
}

th, td {
    border: 1px solid #273b38; /* This is the border of the table */
    padding: 8px;   
    text-align: left;   
}

th {
    background-color: #55f3f04d;  /* first colum */
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Portfolio</title>
    <link rel="stylesheet" href="index.css"> <!-- Linking CSS file -->
</head>
<body>
    <h1>Welcome to My Website</h1>
    <p>Hi, I'm Gustavo, a cybersecurity and developmententhusiast learning C and C++!</p>
    <img src="School_ID/TEST_IMAGE.jpg" alt="Profile Photo" class="profile-photo">
    <div class="square"></div>
    <div class="frame">
        <table>
            <thead>
                <tr>
                    <th>Project Name</th>
                    <th>Description</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>Project 1</td>
                    <td>A brief description of Project 1.</td>
                </tr>
                <tr>
                    <td>Project 2</td>
                    <td>A brief description of Project 2.</td>
                </tr>
            </tbody>
        </table>
    </div>
</body>
</html>

Solution

Is this what you’re looking for? I told the body to be a flex container, with column direction and set its minimum height to be view height. With .frame being told to grow with flex-grow, it takes the remaining of the view.

body {
    background-color: rgba(66, 65, 65, 0.192);
    font-family: Arial, sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

h1, p {
    color: rgba(0, 0, 0, 0.8);
    text-align: center;
    margin: 20px 0; /* Avoid large margins */
}

p{
    font-size: 30px;

}

.profile-photo {
    display: block;
    margin: 20px auto; /* Center image */
    width: 250px;
    height: 200px;
    border-radius: 20%;
    object-fit: cover;
    position: relative;
    z-index: 2; /* Ensure it's above the square */
}

.square {
    width: 100%;
    height: 175px;
    background-color: rgba(203, 137, 4, 0.619);
    position: relative; 
    margin-top: -150px; 
    z-index: -1;
}

.frame {
    border : black 2px solid; /*added to visualize the size of .frame*/
    flex-grow: 1;
    width: 90%;
    max-width: 100%;
    margin: 0 auto;
    background-color: white;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    border-radius: 20%;
}

th, td {
    border: 1px solid #273b38; /* This is the border of the table */
    padding: 8px;   
    text-align: left;   
}

th {
    background-color: #55f3f04d;  /* first colum */
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Portfolio</title>
    <link rel="stylesheet" href="index.css"> <!-- Linking CSS file -->
</head>
<body>
    <h1>Welcome to My Website</h1>
    <p>Hi, I'm Gustavo, a cybersecurity and developmententhusiast learning C and C++!</p>
    <img src="School_ID/TEST_IMAGE.jpg" alt="Profile Photo" class="profile-photo">
    <div class="square"></div>
    <div class="frame">
        <table>
            <thead>
                <tr>
                    <th>Project Name</th>
                    <th>Description</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>Project 1</td>
                    <td>A brief description of Project 1.</td>
                </tr>
                <tr>
                    <td>Project 2</td>
                    <td>A brief description of Project 2.</td>
                </tr>
            </tbody>
        </table>
    </div>
</body>
</html>