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SKILL.md
npx skills add mengto/skills --skill container-lines
Add vertical container-size guide lines with mini corner squares for precise, structured web layouts. Use when asked for container lines, measured layout guides, vertical boundary lines, editorial grid markers, or small corner-square frame details.
npx skills add mengto/skills --skill container-lines
1px with low opacity.Use pseudo-elements on the layout shell.
Add four small squares to sections that need a precise measured feel.
Use the same container width as the line positions.
4px to 8px..container-lines {
position: relative;
isolation: isolate;
}
.container-lines::before,
.container-lines::after {
content: "";
position: absolute;
top: 0;
bottom: 0;
z-index: -1;
width: 1px;
background: var(--line-color);
pointer-events: none;
}
.container-lines::before {
left: max(var(--container-pad), calc((100vw - var(--container-max)) / 2));
}
.container-lines::after {
right: max(var(--container-pad), calc((100vw - var(--container-max)) / 2));
}.corner-squares {
position: relative;
}
.corner-squares > .corner {
position: absolute;
width: var(--corner-size);
height: var(--corner-size);
background: var(--line-strong);
pointer-events: none;
}
.corner.top-left { top: 0; left: 0; transform: translate(-50%, -50%); }
.corner.top-right { top: 0; right: 0; transform: translate(50%, -50%); }
.corner.bottom-left { bottom: 0; left: 0; transform: translate(-50%, 50%); }
.corner.bottom-right { right: 0; bottom: 0; transform: translate(50%, 50%); }<main class="container-lines">
<section class="corner-squares">
<span class="corner top-left"></span>
<span class="corner top-right"></span>
<span class="corner bottom-left"></span>
<span class="corner bottom-right"></span>
...
</section>
</main>.content-container {
width: min(100% - (var(--container-pad) * 2), var(--container-max));
margin-inline: auto;
}