index.scss

.navigation {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 374px;
  height: 55px;
  padding: 0 15px;
  background: #fff;
  box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.05);

  ul {
    height: 55px;
    padding-top: 11px;
    overflow-x: auto;
    white-space: nowrap;
  }

  li {
    display: inline-block;
    width: 34px;
    height: 34px;
    border: 1px solid #09f;
    border-radius: 50%;
    margin-right: 20px;
    color: #09f;
    font-size: 18px;
    text-align: center;
    line-height: 34px;

    &.active {
      color: #fff;
      background-color: #09f;
    }

    &.correct {
      background-color: #2CDBAF;
      border-color: #2CDBAF;
      color: #fff;
    }

    &.error {
      border-color: #E64949;
      color: #fff;
      background-color: #E64949;
    }

    &.unselect {
      border: 1px solid #E64949;
      color: #E64949;
    }
  }
}