I’m looking for feedback about my work on the Fundamental CSS Comprehension exercise. I’m not sure if my footer is aligned perfectly but I can’t figure out how to fix it. Also my background colors seem a bit off.

body, h2, p, article, img, section {
  margin: 0;
  padding: 0;
}

html {
  font-family: 'Helvetica neue', Arial, 'sans serif';
  font-size: 10px;
  background-color: #ccc;
}

article {
	height: 12em;
	background-color: rgba(0,0,0,.2);
}

article p {
	color: white;
	padding: 1em;
}

h2 {
	font-size: 2em;
}

/* Rulesets to be matched up with selectors */

.card {
  width: 35em;
  height: 22em;
  margin: 5em auto;
  background-color: red;
  border: 0.2em solid black;
  border-radius: 1.5em;
}

/* Rulesets for header and footer */

.card header {
	height: 3em;
	margin: 0;
}

.card header {
  background-image: linear-gradient(to bottom,rgba(255,0,0,0.4), rgba(255,0,0,0));
  border-radius: 1.5em 1.5em 0 0;
  padding: 1em;
}

.card footer {
  background-image: linear-gradient(to bottom,rgba(255,0,0,0), rgba(255,0,0,0.4));
  border-radius: 0 0 1.5em 1.5em;
  height: 3em;
  padding: 1em;
  margin: 0;
}

.card footer p {
	margin: 0;
	font-size: 1.5em;
}

/* Rulesets for main card content */

.card article img {
  max-height: 100%;
  float: right;
}