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css/snippets/hamburger-button.md

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+---
+title: Hamburger Button
+type: snippet
+tags: [interactivity]
+cover: volcano-sunset
+dateModified: 2020-12-30T15:37:37+02:00
+---
+
+Displays a hamburger menu which transitions to a cross button on hover.
+
+- Use a `.hamburger-menu` container `div` which contains the top, bottom, and middle bars.
+- Set the container to `display: flex` with `flex-flow: column wrap`.
+- Add distance between the bars using `justify-content: space-between`.
+- Use `transform: rotate()` to rotate the top and bottom bars by 45 degrees and `opacity: 0` to fade the middle bar on hover.
+- Use `transform-origin: left` so that the bars rotate around the left point.
+
+```html
+<div class="hamburger-menu">
+  <div class="bar top"></div>
+  <div class="bar middle"></div>
+  <div class="bar bottom"></div>
+</div>
+```
+
+```css
+.hamburger-menu {
+  display: flex;
+  flex-flow: column wrap;
+  justify-content: space-between;
+  height: 2.5rem;
+  width: 2.5rem;
+  cursor: pointer;
+}
+
+.hamburger-menu .bar {
+  height: 5px;
+  background: black;
+  border-radius: 5px;
+  margin: 3px 0px;
+  transform-origin: left;
+  transition: all 0.5s;
+}
+
+.hamburger-menu:hover .top {
+  transform: rotate(45deg);
+}
+
+.hamburger-menu:hover .middle {
+  opacity: 0;
+}
+
+.hamburger-menu:hover .bottom {
+  transform: rotate(-45deg);
+}
+```