AI Code Review Comments: CSS AI Animation

AI Code Review Comments

A review pass sweeps down a diff and, as it crosses a risky line, a comment bubble springs out beside it with a red, amber or accent severity dot while the header count climbs to 3 comments.

Also known as: ai code review animation, inline pr comments, review bot comments.

Reviewsrc/api/users.ts

Color Base size 16px Dark background

HTML

<div class="aia-inline-review-comments" role="status" aria-label="Claude left 3 review comments">
  <div class="aia-inline-review-comments-head"><b>Review</b><code>src/api/users.ts</code><span class="aia-inline-review-comments-n" aria-hidden="true"></span></div>
  <div class="aia-inline-review-comments-body" aria-hidden="true">
    <p><i>21</i>const id = req.query.id;</p>
    <p class="aia-inline-review-comments-hit" style="--k: 1; --sev: #dc2626"><i>22</i>const rows = await db.query(</p>
    <p><i>23</i>  "SELECT * FROM users</p>
    <p><i>24</i>   WHERE id = " + id);</p>
    <p class="aia-inline-review-comments-hit" style="--k: 4; --sev: #d97706"><i>25</i>limiter.consume(req.ip);</p>
    <p><i>26</i>const t = 60_000;</p>
    <p class="aia-inline-review-comments-hit" style="--k: 6"><i>27</i>return rows[0];</p>
    <span class="aia-inline-review-comments-c" style="--k: 1; --sev: #dc2626; grid-row: 2 / span 2"><b>SQL injection</b>Use a query parameter.</span>
    <span class="aia-inline-review-comments-c" style="--k: 4; --sev: #d97706; grid-row: 5 / span 2"><b>Missing await</b>consume() is async.</span>
    <span class="aia-inline-review-comments-c" style="--k: 6; grid-row: 7 / span 2"><b>Suggestion</b>Return 404 if empty.</span>
    <span class="aia-inline-review-comments-scan"></span>
  </div>
</div>

CSS

@property --aia-inline-review-comments-t {
  syntax: "<number>";
  inherits: true;
  initial-value: 0;
}
@property --aia-inline-review-comments-n {
  syntax: "<integer>";
  inherits: false;
  initial-value: 0;
}
.aia-inline-review-comments {
  --c: var(--aia-color, #7c5cff);
  font-size: var(--aia-size, 16px);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.4;
  position: relative;
  box-sizing: border-box;
  padding: 0.9em 1em;
  border-radius: 0.9em;
  background: color-mix(in srgb, currentColor 3%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, currentColor 11%, transparent), 0 0.1em 0.2em color-mix(in srgb, currentColor 4%, transparent), 0 0.9em 2em -1.1em rgb(0 0 0 / 0.3);
  --d: 9s;
  --t: var(--aia-inline-review-comments-t);
  --lh: 1.6em;
  width: 25.5em;
  padding: 0;
  overflow: hidden;
  animation:
    aia-inline-review-comments-clock var(--d) linear infinite,
    aia-inline-review-comments-fade var(--d) linear infinite;
}
.aia-inline-review-comments-head {
  display: flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.55em 0.85em;
  border-bottom: 1px solid color-mix(in srgb, currentColor 9%, transparent);
  font-size: 0.8em;
}
.aia-inline-review-comments-head code {
  margin-right: auto;
  color: color-mix(in srgb, currentColor 55%, transparent);
  font: 0.92em ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}
.aia-inline-review-comments-n {
  padding: 0.15em 0.55em;
  border-radius: 999em;
  background: color-mix(in srgb, var(--c) 13%, transparent);
  color: color-mix(in srgb, var(--c) 80%, currentColor);
  font-size: 0.9em;
  font-weight: 600;
  --aia-inline-review-comments-n: calc(clamp(0, (var(--t) - 1.2) * 9, 1) + clamp(0, (var(--t) - 4.2) * 9, 1) + clamp(0, (var(--t) - 6.2) * 9, 1) - 0.5);
  counter-reset: n var(--aia-inline-review-comments-n);
}
.aia-inline-review-comments-n::before { content: counter(n) " flagged"; }
.aia-inline-review-comments-body {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 13em;
  grid-auto-rows: var(--lh);
  padding: 0.35em 0.5em 1.1em 0;
  font-size: 0.72em;
}
.aia-inline-review-comments-body p {
  grid-column: 1;
  display: flex;
  align-items: center;
  margin: 0;
  font-family: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  white-space: pre;
}
.aia-inline-review-comments-body i {
  flex: none;
  width: 2.2em;
  padding-right: 1em;
  color: color-mix(in srgb, currentColor 35%, transparent);
  font-style: normal;
  text-align: right;
}
.aia-inline-review-comments-hit {
  --sev: var(--c);
  --p: clamp(0, (var(--t) - var(--k)) * 5, 1);
  position: relative;
  background: color-mix(in srgb, var(--sev) calc(var(--p) * 12%), transparent);
  box-shadow: inset calc(var(--p) * 0.22em) 0 0 var(--sev);
}
.aia-inline-review-comments-c {
  --sev: var(--c);
  --p: clamp(0, (var(--t) - var(--k) - 0.15) * 5, 1);
  position: relative;
  grid-column: 2;
  align-self: start;
  display: grid;
  margin: 0.15em 0 0 0.6em;
  padding: 0.35em 0.6em 0.4em 1.35em;
  border-radius: 0.55em;
  background: color-mix(in srgb, currentColor 4%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, currentColor 11%, transparent), 0 0.5em 1em -0.7em rgb(0 0 0 / 0.35);
  color: color-mix(in srgb, currentColor 62%, transparent);
  font-size: 0.92em;
  line-height: 1.3;
  white-space: nowrap;
  opacity: var(--p);
  transform: translateX(calc((1 - var(--p)) * -0.8em)) scale(calc(0.85 + var(--p) * 0.15));
  transform-origin: left center;
}
.aia-inline-review-comments-c b {
  color: color-mix(in srgb, var(--sev) 70%, currentColor);
  font-weight: 650;
}
.aia-inline-review-comments-c::before {
  content: "";
  position: absolute;
  left: 0.55em;
  top: 0.62em;
  width: 0.5em;
  height: 0.5em;
  border-radius: 50%;
  background: var(--sev);
  box-shadow: 0 0 0 0.2em color-mix(in srgb, var(--sev) 22%, transparent);
}
/* the tail pointing back at the flagged line */
.aia-inline-review-comments-c::after {
  content: "";
  position: absolute;
  left: -0.62em;
  top: 0.75em;
  width: 0.62em;
  height: 1px;
  background: color-mix(in srgb, currentColor 25%, transparent);
}
.aia-inline-review-comments-scan {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(0.35em + var(--t) * var(--lh));
  height: var(--lh);
  background: linear-gradient(90deg, color-mix(in srgb, var(--c) 0%, transparent), color-mix(in srgb, var(--c) 18%, transparent) 50%, color-mix(in srgb, var(--c) 0%, transparent));
  box-shadow: 0 1px 0 color-mix(in srgb, var(--c) 45%, transparent);
  opacity: clamp(0, (7.4 - var(--t)) * 3, 1);
  pointer-events: none;
}
@keyframes aia-inline-review-comments-clock {
  0%, 4% { --aia-inline-review-comments-t: 0; }
  16%, 24% { --aia-inline-review-comments-t: 1.4; }
  40%, 48% { --aia-inline-review-comments-t: 4.4; }
  58%, 62% { --aia-inline-review-comments-t: 6.4; }
  70%, 97% { --aia-inline-review-comments-t: 7.6; }
  98%, 100% { --aia-inline-review-comments-t: 0; }
}
@keyframes aia-inline-review-comments-fade {
  0%, 94% { opacity: 1; }
  98%, 99% { opacity: 0; }
  100% { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .aia-inline-review-comments {
    animation: none;
    --aia-inline-review-comments-t: 7.6;
  }
}

@media (prefers-reduced-motion: reduce) {
  .aia-inline-review-comments, .aia-inline-review-comments *, .aia-inline-review-comments::before, .aia-inline-review-comments::after, .aia-inline-review-comments *::before, .aia-inline-review-comments *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

Customizing this snippet

Color: set --aia-color on the element or a parent. Currently previewing #3b82f6.
Base size: set --aia-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 16px.
Speed: change the duration on the transition or animation shorthand. Staggered delays are relative, so they keep their rhythm.
Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.

AI Code Review Comments

HTML

CSS

Customizing this snippet

Similar ai animations