index.css

*,
*::before,
*::after {
  box-sizing: inherit;
}

html {
  align-items: center;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  height: 100%;
  justify-content: center;
  width: 100%;
}

body {
  align-items: center;
  display: flex;
  flex-direction: row;
  height: 100%;
  justify-content: center;
  margin: 0;
  width: 100%;
}

.Footer {
  bottom: 0;
  display: flex;
  height: 42px;
  justify-content: flex-end;
  left: 0;
  padding-right: 9px;
  position: fixed;
  right: 0;
}

.Footer-link {
  text-decoration: none;
  width: 42px;
  height: 42px;
  fill: rgb(153, 153, 153);
  transition: fill 200ms;
  display: flex;
}

.Footer-link:hover,
.Footer-link:focus {
  fill: rgb(47, 161, 214);
}

.Footer-icon {
  width: 24px;
  height: 24px;
  margin: auto;
}