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Hey there! Let's break down these two web development questions for you—since I can't access external sites directly, I'll walk you through the standard, widely-used methods that achieve the effects you're describing:

Most modern websites rely on CSS layout systems to control element positioning, with these common approaches:

• Flexbox: Using display: flex on a parent container, paired with properties like justify-content (for horizontal alignment) and align-items (for vertical alignment), makes it trivial to center elements, space them evenly, or align them to specific edges. It's the go-to for most one-dimensional (row/column) layouts.
• CSS Grid: For more complex two-dimensional layouts (think multi-column content areas or asymmetric grids), display: grid lets you define explicit rows/columns with grid-template-columns/grid-template-rows, then place elements precisely using grid-column and grid-row properties.
• Relative + Absolute Positioning: For elements that need to break out of the normal document flow (like floating navigation bars or decorative overlays), set a parent to position: relative (to act as a positioning reference), then use position: absolute on the child, along with top/left/right/bottom to place it exactly where you want.
• Box Model Basics: Simple text blocks and static content often use the core CSS box model—setting margin: auto for horizontal centering, or using padding to control spacing between an element's content and its edges.

The effect you're describing—elements maintaining even spacing from window edges as you resize the browser—almost always uses pure CSS, no JavaScript or jQuery required. Here are the most common techniques:

• Percentage-Based Spacing: Set container margins or widths to percentages (e.g., margin: 0 5% or width: 90%). This ensures the spacing scales proportionally with the window size, keeping the distance relative to the viewport.
• Max-Width + Auto Margins: For content that shouldn't stretch too wide on large screens, combine max-width: 1200px (adjust the value to fit your design) with margin: 0 auto. On screens larger than 1200px, the container stays centered with equal automatic margins on both sides. On smaller screens, it fills the viewport, and you can add padding: 0 1.5rem to keep consistent inner spacing from the edges.
• Viewport Units (vw/vh): Use vw (viewport width) units for margins—e.g., margin: 0 3vw. 1vw equals 1% of the window's width, so the spacing will automatically shrink or grow as you resize the browser, creating a perfectly responsive gap between elements and edges.
• Media Queries: For more granular control across device sizes, use media queries to adjust margins/padding for specific breakpoints:

  /* Mobile screens */
  @media (max-width: 768px) {
    .content-wrapper {
      margin: 0 1rem;
    }
  }
  /* Desktop screens */
  @media (min-width: 769px) {
    .content-wrapper {
      margin: 0 4rem;
    }
  }
  

While JavaScript can be used for highly custom resize behavior (like non-linear spacing adjustments), the basic adaptive margin effect you're seeing is definitely achievable with just CSS.

内容的提问来源于stack exchange，提问作者Chris Churchill