Css Zero Showcase
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<div class="sidebar-layout">
  <header id="header">
    <div class="hide@md" data-controller="dialog">
      <button class="btn btn--icon" data-action="dialog#showModal">
        <img aria-hidden="true" src="/assets/menu-5b8caef9.svg" width="20" height="20" />
        <span class="sr-only">Open menu</span>
      </button>
      <dialog class="sheet sheet--left" data-dialog-target="menu" data-action="click->dialog#closeOnClickOutside">
        <button class="btn btn--plain sheet__close" data-action="click->dialog#close">
          <img aria-hidden="true" src="/assets/x-2fabf707.svg" width="16" height="16" />
          <span class="sr-only">Close</span>
        </button>
        <div class="sheet__content">
          <h1>Mobile menu</h1>
        </div>
      </dialog>
    </div>
    <h1>Header</h1>
  </header>
  <aside id="sidebar">
    <div class="p-2">Sidebar</div>
  </aside>
  <main id="main">
    <div>Line 1</div>
    <div>Line 2</div>
    <div>Line 3</div>
    <div>Line 4</div>
    <div>Line 5</div>
    <div>Line 6</div>
    <div>Line 7</div>
    <div>Line 8</div>
    <div>Line 9</div>
    <div>Line 10</div>
  </main>
</div>
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<div class="sidebar-layout">
  <header id="header">
    <%= render "mobile_menu" %>
    <h1>Header</h1>
  </header>
  <aside id="sidebar">
    <div class="p-2">Sidebar</div>
  </aside>
  <main id="main">
    <div>Line 1</div>
    <div>Line 2</div>
    <div>Line 3</div>
    <div>Line 4</div>
    <div>Line 5</div>
    <div>Line 6</div>
    <div>Line 7</div>
    <div>Line 8</div>
    <div>Line 9</div>
    <div>Line 10</div>
  </main>
</div>
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.sidebar-layout {
  display: grid;
  grid-template-areas: "header header" "sidebar main";
  grid-template-columns: var(--sidebar-width, 0) 1fr;
  grid-template-rows: auto 1fr;
  block-size: 100dvh;
  @media (width >= 48rem) {
    --sidebar-border-width: var(--border);
    --sidebar-padding: var(--size-2);
    --sidebar-width: 220px;
  }
  @media (width >= 64rem) {
    --sidebar-border-width: var(--border);
    --sidebar-padding: var(--size-4);
    --sidebar-width: 280px;
  }
}
.header-layout {
  display: grid;
  grid-template-areas: "header" "main";
  grid-template-rows: auto 1fr;
  block-size: 100dvh;
}
.centered-layout {
  display: grid;
  place-items: center;
  block-size: 100dvh;
}
.container {
  inline-size: 100%;
  margin-inline: auto;
  max-inline-size: var(--container-width, 64rem);
}
#header {
  align-items: center;
  border-block-end-width: var(--border);
  block-size: var(--size-16);
  display: flex;
  gap: var(--size-4);
  grid-area: header;
  padding-inline: var(--size-4);
  @media (width >= 64rem) {
    padding-inline: var(--size-6);
  }
}
#sidebar {
  border-inline-end-width: var(--sidebar-border-width, 0);
  display: flex;
  flex-direction: column;
  grid-area: sidebar;
  gap: var(--size-2);
  overflow-x: hidden;
  padding: var(--sidebar-padding, 0);
}
#main {
  display: flex;
  flex-direction: column;
  gap: var(--size-4);
  grid-area: main;
  overflow: auto;
  padding: var(--size-4);
  @media (width >= 64rem) {
    gap: var(--size-6); padding: var(--size-6);
  }
}
Java Script is not required or multiple files are needed, check the notes.