How can I “pin” one node to left viewport edge, while keeping other node horizontally centered relative to viewport?

问题

How can I pin Menu to the left edge of the viewport, while keeping My Awesome Site horizontally centered (relative to the viewport)? align-items: center and justify-content: center are just starting points... I don't know if I need to use a combination of other Flexbox rules.

Requirements:

Use Flexbox.
Don't add any more HTML.
Keep the CSS as clean as possible.

Notes:

align-items: center and justify-content: center are just guesses... I'm cool with other Flexbox combinations.

header {
  display: flex;
  align-items: center;
  justify-content: center;
}
a {
  background-color: beige;
}
h1 {
  background-color: yellow;
}

<header>
  <a>Menu</a>
  <h1>My Awesome Site</h1>
</header>

回答1:

The most simple and efficient that comes to mind is using position: absolute, though based on other requirements it might need another solution

header {
  display: flex;
  align-items: center;
  justify-content: center;
}
a {
  position: absolute;
  left: 0;
  background-color: beige;
}
h1 {
  background-color: yellow;
}

<header>
  <a>Menu</a>
  <h1>My Awesome Site</h1>
</header>

If you can give the "Menu" a fixed width, you can do this,

header {
  display: flex;
  align-items: center;
  justify-content: center;
}
a {
  width: 80px;  
  margin-right: -80px;
  background-color: beige;
}
h1 {
  margin: 0 auto;
  background-color: yellow;
}

<header>
  <a>Menu</a>
  <h1>My Awesome Site</h1>
</header>

or this.

header {
  display: flex;
  align-items: center;
  justify-content: center;
}
a {
  width: 80px;  
  background-color: beige;
}
h1 {
  flex: 1;
  margin-right: 80px;
  background-color: yellow;
  text-align: center;
}

<header>
  <a>Menu</a>
  <h1>My Awesome Site</h1>
</header>

回答2:

This is my solution. I haven't added more HTML but I just used the semantic naming.

<!DOCTYPE html>
<html lang="en-GB">
    <head>
        <title>My Awesome Site</title>
        <style>
            html, body {
                padding: 0; margin: 0;
            }

            .my-awesome-flex-container {
                display: flex;
            }

            .my-awesome-flex-item {
                padding: 1em;
                flex-grow: 1;
            }

            .my-awesome-menu {
                background-color: #3d94a6;
            }

            .my-awesome-site {
                background-color: #c8c8c3;
                text-align: center;
                flex-grow: 6;
            }
        </style>
    </head>
    <body>
        <header class="my-awesome-flex-container">
            <nav class="my-awesome-flex-item my-awesome-menu">
                Menu
            </nav>

            <section class="my-awesome-flex-item my-awesome-site">
                My Awesome Site
            </section>
        </header>
    </body>
</html>

回答3:

Setting margin-left and right to auto, you can align the second element in the center.

header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
}
a {
  background-color: beige;
}
h1 {
  background-color: yellow;
  margin-left: auto;
  margin-right: auto;
}

<header>
  <a>Menu</a>
  <h1>My Awesome Site</h1>
</header>

来源：https://stackoverflow.com/questions/41403326/how-can-i-pin-one-node-to-left-viewport-edge-while-keeping-other-node-horizon

标签

css

flexbox