MireaFrontend/src/styles.css

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: Roboto, "Helvetica Neue", sans-serif;
}

.green-snackbar, .mat-mdc-snack-bar-container {
  --mdc-snackbar-container-color: #8CBA51;
  color: black;
}

.red-snackbar {
  --mdc-snackbar-container-color: #E20338;
  color: white;
}

.yellow-snackbar {
  --mdc-snackbar-container-color: #FFD600;
  color: black;
}

.snackbar {
  --mdc-snackbar-container-color: inherit;
  color: inherit;
}