base.css

html, body {
  margin: 0;
  background: #ffebb8;
  font-family: "Yu Gothic Medium","YuGothic Medium", YuGothic, "Yu Gothic","ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
}

body {
  min-width: 900px;
}

#header {
  width: 100%;
  height: 60px;
  background-color: #FFF;
  position: fixed;
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin-right: -15px;
  margin-left: -15px;
}

.col-auto {
  -webkit-box-flex: 0;
  -ms-flex: 0 0 auto;
  flex: 0 0 auto;
  width: auto;
  max-width: none;
}

.col, .col-auto {
  position: relative;
  min-height: 1px;
  padding-right: 15px;
  padding-left: 15px;
}

.col {
  -ms-flex-preferred-size: 0;
  flex-basis: 0;
  -webkit-box-flex: 1;
  -ms-flex-positive: 1;
  flex-grow: 1;
  max-width: 100%;
}

.l-header_logo {
  margin-left: 30px;
  display: inline-block;
  margin-left: 10px;
  padding: 5px 0;
  width: 160px;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

.l-header_nav {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: end;
  -ms-flex-pack: end;
  justify-content: flex-end;
}

.l-header_links {
  display: block;
  padding: 16px 0;
  height: 60px;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  font-size: 24px;
  font-size: 1.5rem;
  font-weight: 700;
}

.l-header_links a {
  display: inline-block;
  margin-right: 2em;

  text-decoration: none;
  color: inherit;
}

#footer {
  background: #73533b;
  color: white;
  padding: 3rem;
  text-align: center;
}

#footer .old {
  margin: 1rem 0;
}
#footer .old a {
  color: white;
  margin: 0 1rem;
}