/* ---- grid ---- */
.grid {
  /* center */
  margin: 0 auto;
}

/* clearfix */
.grid:after {
  content: '';
  display: block;
  clear: both;
}

/* ---- grid-item ---- */
.grid-item {
  width: 300px;
  float: left;
  background: none;
  margin-bottom: 20px;
}

@media screen and (min-width: 1024px) {
  .banner {
    box-sizing: border-box;
    width: 80%;
    margin: 0 auto;
  }
}

/* SP版 */
@media screen and (max-width: 1023px) {
  .banner {
    box-sizing: border-box;
    width: 100%;
    margin: 0 auto;
  }
}