* {
  margin: 0;
  padding: 0;
  font-family: "MS Mincho";
  list-style: none;
  text-decoration: none;
}

:root {
  --section-border: 700px;
}

header {
  display: flex;
  justify-content: space-between;
  height: 100px;
  width: 65%;
  margin: 0 auto;
  /* position: static; */
  /* background-color: #c9c9c9; */
  /* opacity: 0.7; */
  /* position: sticky; */
  /* top: 0; */
}

.top_text {
  display: flex;
  margin: auto auto auto 0;
}

h1 {
  line-height: 100px;
  margin: 0 0 0 25px;
}

.header_nav {
  margin: auto 0 auto auto;
  width: 50%;
}

.header_ul {
  width: 50%;
  display: flex;
  margin: 0 0 0 auto;
  /* justify-content: space-around; */
}

.header_ul a {
  font-size: 1.2em;
  color: #000;
  margin: 0 16px 0 0;
}