Header and footer is not taking full width

The header and footer works fine in laptop screen. But when I turn on responsive screen and test it in different width, the header and footer both decreases in width. What I want is that when I reduce the width of the screen the header and footer should still take 100% width of the screen like it is supposed to.

body{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.header {
    display: flex;
    flex-direction: row;
    width: 100%;
    align-items: center;
    justify-content: space-evenly;
    background-color: aqua;
    margin-top: 0.5rem;
}

.left {
    line-height: 0.8;
    display: grid;
    grid-column: 1;
    justify-content: center;
    margin-right: 4rem;
    font-family: "Shadows Into Light", cursive;
    font-style: normal;
    cursor: none;
}

.left-title {
    margin: 0;
    text-align: center;
    padding: 0;
    font-size:2rem;
    text-decoration: underline;
    text-decoration-color: #3C4242;
    font-weight: 600;
}

.middle {
    display: flex;
    flex-direction: row;
    margin-right: 5rem;
}

.link {
    margin-left: 5rem;
    text-decoration: none;
    color: #3C4242;
    font-size: large;
}

.link:hover{
    color: #0d0d0d;
}

.right {
    display: flex;
    flex-direction: row;
    align-items: center;
    margin-left: 3rem;
}

.person {
    cursor: pointer;
    margin:0 1rem 0 1rem
}

.cart {
    cursor: pointer;
}

.footer{
    display: flex;
    width: 100%;
    flex-direction: column;
    background-color: #3C4242;
    color: #F6F6F6;
    width: 100% !important;
}

.info {
    margin-top: 1rem;
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
}

.info > div > p{
    cursor: pointer;
}

.icons {
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
    align-items: center;
}

.social {
    padding-top: 1.5rem;
    align-content: center;
}

.icons > div > span {
    height: 1.5rem;
    width: 5rem;
}

.download > h1 {
    line-height: 0.5;
}

.copyright {
    text-align: center;
    margin-top: 2rem;
    margin-bottom: 3rem;
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="mystyle.css">
    <title>Document</title>
</head>
<body>
    <header class="header">
        <div class='left'>
            <p class='left-title'>
                test Store
            </p>
        </div>
        <div class='middle'>
            <a class="link" href="/">Shop</a>
            <a class="link" href="/">Men</a>
            <a class="link" href="/">Women</a>
            <a class="link" href="/">Combos</a>
        </div>
        <div class='right'>
            <span>search</span>
            <span class="cart">cart</span>
            <span class="person">person</span>
        </div>
    </header>
    <main>test page</main>
    <footer class="footer">
        <div class='info'>
            <div>
              <h1>Need Help</h1>
              <p>Contact Us</p>
              <p>Track Order</p>
              <p>FAQ's</p>
              <p>Career</p>
            </div>
            <div>
              <h1>Company</h1>
              <p>About Us</p>
              <p>Euphoria Blog</p>
              <p>Collaboration</p>
              <p>Media</p>
            </div>
            <div>
              <h1>More Info</h1>
              <p>Terms and Conditions</p>
              <p>Privacy Policy</p>
              <p>Shipping Policy</p>
            </div>
            <div>
              <h1>Location</h1>
              <h5>[email protected]</h5>
              <h5>Banani, Dhaka, Bangladesh</h5>
            </div>
          </div>
          
          <div class='icons'>
            <div className='social'>
              <span>icon</span>
              <span>icon</span>
              <span>icon</span>
            </div>
            <div class='download'>
              <h1>Download The App</h1>
              <span>icon</span>
              <span>icon</span>
            </div>
          </div>
          <div class='copyright'><span>Copyright © 2024 Euphoria Ltd. All rights reserved</span></div>
    </footer>
</body>
</html>

I tried using media query but it is not working

Solution

The issue occurs because the header is overflowing. To fix this, you just need to add the flex-wrap: wrap; property to both the header and footer. but don't forget to make the header responsive for mobile sizes :) .

overflow: hidden; /* Added to ensure content is contained */

body{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.header {
    display: flex;
    flex-direction: row;
    width: 100%;
    align-items: center;
    justify-content: space-evenly;
    background-color: aqua;
    margin-top: 0.5rem;
    flex-wrap: wrap; /* Added to ensure content is contained */

}

.left {
    line-height: 0.8;
    display: grid;
    grid-column: 1;
    justify-content: center;
    margin-right: 4rem;
    font-family: "Shadows Into Light", cursive;
    font-style: normal;
    cursor: none;
}

.left-title {
    margin: 0;
    text-align: center;
    padding: 0;
    font-size:2rem;
    text-decoration: underline;
    text-decoration-color: #3C4242;
    font-weight: 600;
}

.middle {
    display: flex;
    flex-direction: row;
    margin-right: 5rem;
}

.link {
    margin-left: 5rem;
    text-decoration: none;
    color: #3C4242;
    font-size: large;
}

.link:hover{
    color: #0d0d0d;
}

.right {
    display: flex;
    flex-direction: row;
    align-items: center;
    margin-left: 3rem;
}

.person {
    cursor: pointer;
    margin:0 1rem 0 1rem
}

.cart {
    cursor: pointer;
}

.footer{
    display: flex;
    width: 100%;
    flex-direction: column;
    background-color: #3C4242;
    color: #F6F6F6;
    width: 100% !important;
    overflow: hidden; /* Added to ensure content is contained */
}

.info {
    margin-top: 1rem;
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
}

.info > div > p{
    cursor: pointer;
}

.icons {
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
    align-items: center;
}

.social {
    padding-top: 1.5rem;
    align-content: center;
}

.icons > div > span {
    height: 1.5rem;
    width: 5rem;
}

.download > h1 {
    line-height: 0.5;
}

.copyright {
    text-align: center;
    margin-top: 2rem;
    margin-bottom: 3rem;
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="mystyle.css">
    <title>Document</title>
</head>
<body>
    <header class="header">
        <div class='left'>
            <p class='left-title'>
                test Store
            </p>
        </div>
        <div class='middle'>
            <a class="link" href="/">Shop</a>
            <a class="link" href="/">Men</a>
            <a class="link" href="/">Women</a>
            <a class="link" href="/">Combos</a>
        </div>
        <div class='right'>
            <span>search</span>
            <span class="cart">cart</span>
            <span class="person">person</span>
        </div>
    </header>
    <main>test page</main>
    <footer class="footer">
        <div class='info'>
            <div>
              <h1>Need Help</h1>
              <p>Contact Us</p>
              <p>Track Order</p>
              <p>FAQ's</p>
              <p>Career</p>
            </div>
            <div>
              <h1>Company</h1>
              <p>About Us</p>
              <p>Euphoria Blog</p>
              <p>Collaboration</p>
              <p>Media</p>
            </div>
            <div>
              <h1>More Info</h1>
              <p>Terms and Conditions</p>
              <p>Privacy Policy</p>
              <p>Shipping Policy</p>
            </div>
            <div>
              <h1>Location</h1>
              <h5>[email protected]</h5>
              <h5>Banani, Dhaka, Bangladesh</h5>
            </div>
          </div>
          
          <div class='icons'>
            <div className='social'>
              <span>icon</span>
              <span>icon</span>
              <span>icon</span>
            </div>
            <div class='download'>
              <h1>Download The App</h1>
              <span>icon</span>
              <span>icon</span>
            </div>
          </div>
          <div class='copyright'><span>Copyright © 2024 Euphoria Ltd. All rights reserved</span></div>
    </footer>
</body>
</html>