Center (Circle) Div in Footer

Question

I have a Circle Div in my Footer and want to Center it into the Footer. At the End there will be 3 Circles in a Row. My CSS:

.circle {
  height: 50px;
  width: 50px;
  background-color: rgba(0, 0, 0, 0.90);
  border-radius: 50%;
  text-align: center;
  font-size: 30px;
}

footer {
  text-align: center;
  position: fixed;
  bottom: 0;
  width: 100%;
  background-color: green;
}

Answer 1

You can use display:flex and align-items & justify-content to align it both vertically and horizontally.

body, html {
  padding: 0;
  margin: 0;
}
footer {
  width: 100%;
  background-color: #dedede;
  border-radius: 5px;
  padding: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.circle {
  border-radius: 50%;
  width: 40px;
  height: 40px;
  background-color: black;
}

<footer>
<div class="circle"></div>
</footer>