Note that <code>ms</code> stands for milliseconds, where 1000ms is equal to 1s.
Use CSS <code>@keyframes</code> to change the <code>background-color</code> of the <code>button</code> element so it becomes <code>#4791d0</code> when a user hovers over it. The <code>@keyframes</code> rule should only have an entry for <code>100%</code>.
testString: assert(code.match(/@keyframes\s+?background-color\s*?{/g), 'The @keyframes rule should use the <code>animation-name</code> background-color.');
- text: There should be one rule under <code>@keyframes</code> that changes the <code>background-color</code> to <code>#4791d0</code> at 100%.
testString: assert(code.match(/100%\s*?{\s*?background-color:\s*?#4791d0;\s*?}/gi), 'There should be one rule under <code>@keyframes</code> that changes the <code>background-color</code> to <code>#4791d0</code> at 100%.');