.race-contents{
  width: 1162px;
  margin: 0 auto;
  margin-bottom: 30px;
}

.race-box{
  box-sizing: border-box;
  background-color: #fff;
  width: 402px;
  height: 400px;
  padding: 31px;
  float: right;
}

.race-index li{
  font-family: 'Roboto', sans-serif;
  font-size: 16px;
  line-height: 1.8rem;
}
.race-index li a:hover{text-decoration: underline; }
.race-index li::before{
  content: url('/2021/img/race-i/arrow.gif');
  margin-right: 15px;
}
.ub-nbr{
  border-bottom: 2px solid #a6112d;
  margin-bottom: 30px;
}
.ub-sgt{
  border-bottom: 2px solid #004bd4;
  margin-bottom: 30px;
}
.ub-rally{
  border-bottom: 2px solid #008a33;
  margin-bottom: 30px;
}
.ub-86brz{
  border-bottom: 2px solid #6e00d5;
  margin-bottom: 30px;
}

@media screen and (max-width: 600px) {
  .race-contents,.race-box{
    width: 100%;
    float: none;
  }
  .race-box{height: 300px;padding-top: 0;}
}