How to create white margins from the left and right side of html page

I have uploaded my code for one page. My goal is to create margins from the left and right sides. The idea is to make the content centered with margins. I have a css code but please keep in mind there is extra code that leads to other pages as well.

For an idea of what needs to be achieved, I have uploaded a link of a site mimicking my goal. https://aliabdaal.com

.navbar1 {
  padding: 0;
  margin: 0;
}

.nav {
  text-align: center;
}

#backroundcolourthing {
  background-color: rgb(247, 251, 255);
  padding: 10px;
  border: 0px solid green;
  width: auto;
  height: 550px;
}

nav {
  display: flex;
  /* 1 */
  justify-content: space-between;
  /* 2 */
  padding: 1rem 2rem;
  /* 3 */
  background: rgb(245, 250, 255);
  /* 4 */
}

.barsection {
  margin: right;
}

nav ul {
  display: flex;
  /* 5 */
  list-style: none;
  /* 6 */
  margin: auto;
}

nav li {
  padding-left: 3rem;
  /* 7! */
  margin: 3%;
  margin-left: 20px;
}

nav a {
  text-decoration: none;
  color: black;
  font-size: 20px;
  font-family: sans-serif light;
}

.aboutmeh2 {
  font-size: 40px;
  font-family: Optima;
  text-align: center;
}

.shortsryh2 {
  font-size: 20px;
  font-family: Optima;
  text-align: center;
}

.para2 {
  max-width: 900px;
  min-width: 100px;
  max-height: 1000px;
  min-height: 900px;
  background-color: rgb(255, 255, 255);
}

.a {
  font-size: 20px;
  font-family: sans-serif light;
  color: rgb(24, 24, 24);
  text-align: left;
  margin-top: 4rem;
}

.headingforsmth {
  font-size: 25px;
  text-align: center;
}

.centerimgonline {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}

.introname {
  font-size: 40px;
  font-family: Tahoma;
  text-align: center;
}

.introphrase1 {
  font-size: 28px;
  font-family: Optima;
  text-align: center;
}

.introphrase3 {
  font-size: 20px;
  font-family: Optima;
  text-align: center;
}

.post-header {
  margin: 0 -1rem;
  width: calc(100%   2rem);
  padding: 3rem 1rem;
  background-color: rgb(255, 255, 255);
}

.home__video,
.home__intro {
  margin: 0;
  width: 46%;
}

.container {
  max-width: 1040px;
  margin-left: auto;
  margin-right: auto;
}

.para1 {
  max-width: 900px;
  min-width: 100px;
  max-height: 1000px;
  min-height: 900px;
  background-color: rgb(228, 228, 228);
}

.table-of-contents {
  padding: 2rem;
  background-color: green;
}

.post-content {
  line-height: 1.7;
}

.para3 {
  max-width: 900px;
  min-width: 100px;
  max-height: 1000px;
  min-height: 900px;
  background-color: rgb(118, 122, 179);
}

.myphoto {
  display: flex;
  flex-direction: column;
  margin: -14em auto;
  margin-left: 90em;
  max-width: 1140px;
  width: 39%;
  z-index: -1;
  transform: rotate(-20deg);
}

.myclass {
  color: rgb(61, 88, 124);
}

<div id="backroundcolourthing">
  <div >
    <nav>
      <div >
        <div>
          <h2>VovaSite</h2>
        </div>
      </div>

      <div >
        <div >
          <ul >
            <li>
              <a href="Homepage.html">Home</a>
            </li>

            <li>
              <a href="aboutme.html">About</a>
            </li>

            <li>
              <a href="articles.html">articles</a>
            </li>

            <li>
              <a href="articles.html">articles</a>
            </li>

            <li>
              <a href="articles.html">articles</a>
            </li>

            <li>
              <a href="articles.html">articles</a>
            </li>
          </ul>
        </div>
      </div>
    </nav>
  </div>

  <div>
    <div>
      <div >
        <h2 > Hi guys - </h2>
        <p > I'm name. I am a soon-to-be-
          <a  href="http://www.google.com">Youtuber.</a>
        </p>
        <p >
          something text boring intresting information lol
        </p>
      </div>
      <div>
        <div >
          <img  alt="Pacific" src="img4.jpg" style="
    border-radius: 10px; transform:rotate(0deg);">
        </div>
      </div>
    </div>
  </div>
</div>

CodePudding user response：

if I can understand you, for this case. You would define a width in percentage and then add a new rule in css with a margin auto, this it will do your content be center. (I'm so sorry for my english, I'll hope that you can understand me)

Ej:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document Example</title>
    <style>
        .main{
            width: 85%;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <main >
        <!--Content here-->
    </main>
</body>
</html>

CodePudding user response：

In your <ul >, you can put the css below:

ul.nav {
   display:flex;
   justify-content:center;
}

This is the best way in my opinion, but you can put with margin like a margin: 0 auto.