* {
  box-sizing: border-box;
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  font-size: 16px;
}

body {
  background-color: #FFFFFF;
  margin: 0;
}

.navtop {
  background-color: #28303d;
  height: 60px;
  width: 100%;
  border: 0;
}
.navtop div {
  display: flex;
  align-items: center;
  margin: 0 auto;
  width: 800px;
  height: 100%;
}
.navtop div h1 {
  flex: 1;
  font-size: 18px;
  padding: 0;
  margin: 0;
  color: rgb(233.5, 234.3, 235.6);
  font-weight: 500;
}

.content {
  width: 800px;
  margin: 0 auto;
}
.content > h2 {
  margin: 0;
  padding: 35px 0 20px 0;
  font-size: 26px;
  font-weight: 600;
  color: #666666;
}
.content > p {
  font-size: 16px;
  line-height: 1.6;
  margin: 0;
  padding: 15px 0;
  color: #333333;
}

@media screen and (max-width: 800px) {
  .navtop {
    height: auto;
  }
  .navtop div {
    flex-flow: wrap;
    width: 100%;
  }
  .navtop div h1 {
    display: block;
    flex-basis: 100%;
    padding: 15px 10px;
  }
  .content {
    padding: 10px;
    width: 100%;
  }
}