* {
  box-sizing: border-box;
}

html {
  font-size: 1vw;
  line-height: max(4vh,3em);
  color: white;
}

body {
  margin: 0;
  padding: 0;
  background-color: #121212;
}

header {
  padding: 10px 4% 10px;
  position: sticky;
  top: 0;
  width: 100%;
  background-color: #2c3e50;
  display: flex;
  align-items: center;
  z-index: 999;
}

header li:hover {
  background-color: #34495e;
}

main {
  margin: 0 calc((100% - 240px)/4);
  z-index: 1;
  font-size: max(1rem, 12px);
}

h1 {
  margin: 0;
  padding: 0;
  font-size: max(2.3rem, 12px);
}

h2 {
  padding-left: 0.8em;
}
h3{
  margin-top: 0;
  margin-bottom: 0.6em;
}
h4{
  margin-top: 0;
  margin-bottom: 1rem;
}
a {
  text-decoration: none;
  color: #3498db;
}

ul {
  list-style: none;
  margin: 0;
  display: flex;
  padding-left: 0;
}

li {
  font-size: max(1.4rem, 12px);
}

.Mset li {
  display: flex;
  align-items: center;
}

.Mset li strong {
  min-width: 80px;
  display: inline-block;
  letter-spacing: 10px;
}

nav {
  margin: 0 0 0 auto;
}

.Lset {
  margin: 30px 0;
  border: solid #3498db;
  background-color: #1e272e;
}

.Mset {
  margin: 10px 0.8em;
  border: solid #3498db;
  background-color: #1e272e;
  padding: 0.8em;
}

.Sset {
  align-items: start;
  margin: 5px 0.8em;
  border: solid #3498db;
  background-color: #192734;
  font-size: max(1.3rem, 12px);
  padding: 1em;
}

.title {
  font-weight: bolder;
  font-size: max(1.7rem, 12px);
  padding: 0.6em;
  margin-bottom: 0;
}

.Stitle {
  font-weight: bolder;
  font-size: max(1.5rem, 12px);
  padding: 0.6em;
  margin-bottom: 0;
}

.setumei {
  padding: 0.8em;
  margin-top: 0;
  padding-top: 0;
}

#Oseroyoutube {
  width: 70%;
  aspect-ratio: 16 / 9;
}

.tinkercad {
  color: #e74c3c;
  text-decoration:underline;
}
.github{
  color: rgb(133, 131, 131);
  text-decoration:underline;
}
#qiita {
  color: #27ae60;
  text-decoration:underline;
}

.scratch {
  color: #ff6b00;
  text-decoration:underline;
}

.img {
  background-color: #34485b;
  padding: 5px;
}

footer {
  background-color: #2c3e50;
  font-size: max(1.5rem, 16px);
}

footer h2{
  margin: 0;
  padding: 5px;
}
footer a:hover {
  background-color: #34495e;
}

#footer {
  border: solid #3498db;
  padding: 5px;
}

#links{
  font-size: max(1.3rem,12px);
}
.skl{
  margin: 0;
}

#back{
  padding: 5px;
}