css

html {
  font-size: 62.5%;
}
Veldana

body {
  color: black;
  font-family: NotoSansJP;
  font-size: 1.5rem;
  letter-spacing: 0.2rem;
}

img {
  max-width: 100%;
  position: relative;
  vertical-align: bottom;
}

a {
  color: #000;
  text-decoration: underline;
}

ul {
  list-style: none;
}

.wrapper, .footer-box {
  width: 950px;
  max-width: 950px;
  margin: 0 auto;
  padding-top: 2rem;
}

.align-center {
  text-align: center;
}

.color-black {
  color: #333333;
}

.italic {
  font-style: italic;
}

.main-text {
  font-size: 1.2em;
}

.main-text15 {
  font-size: 1.4em;
}

.main-text17 {
  font-size: 1.7em;
}

.margin-t_10 {
  margin-top: 10px;
}

.margin-t_5 {
  margin-top: 5px;
}

.margin-t_30 {
  margin-top: 30px;
}

.margin-t_60 {
  margin-top: 60px;
}

.margin-b_40 {
  margin-bottom: 40px;
}

.d-block {
  display: block;
}

.margin-center {
  margin: 0 auto;
}


/*トップページ*/

.back {
  background-image: url(https://surf-dream.neocities.org/mateial/wp_beach4.jpg);
  background-repeat: repeat-x;
  background-position: bottom;
  background-color: #97C4EB;
  padding: 20px 0 130px 0;
}

footer {
  background-color: #f6f6f3;
  padding: 20px 0;
}

.footer-box {
  text-align: center;
}

.logo {
  width: 35%;
  margin: 0 auto;
}

.marquee {
  margin: 1rem auto 0 auto;
  width: 40%;
}

.nav-container {
  margin: 3rem;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 6rem;
}

.main-container {
  display: flex;
}

.left-container {
  width: calc(100% / 3);
  margin-top: 20px;
  text-align: right;
}

.right-container {
  width: calc(100% / 3);
  margin-top: 20px;
}

.left-h2, .right-h2 {
  position: relative;
  color: #E02B20;
  font-style: italic;
}

.left-h2.before:before {
  content: url(https://surf-dream.neocities.org/mateial/creamsoda.gif);
  position: absolute;
  top: -134%;
  left: 124px;
  transform: scale(0.7);
  display: inline-block;
}

.right-h2.before:after {
  content: url(https://surf-dream.neocities.org/mateial/012.gif);
  position: absolute;
  top: -80%;
  left: 67px;
  display: inline-block;
}

.center-container {
  width: 500px;
  text-align: center;
  margin: 0 50px;
}

.center-img {
  border: double 4px;
}

.center-text {
  font-size: .8em;
  color: #515151;
  margin-top: 5px;
  text-align: center;
}

.center-banner {
  margin-top: 50px;
}

.update-box {
  width: 200px;
  font-size: 13px;
  border: solid 1px;
  height: 210px;
  overflow-y: scroll;
  padding-bottom: 15px;
  padding-left: 5px;
  display: inline-block;
}

.update-new:after {
  content: url(https://surf-dream.neocities.org/mateial/red2.gif);
}

.update-2002:before {
  content: url(https://surf-dream.neocities.org/mateial/red2.gif);
}

.web-clap {
  display: inline-block;
  padding: 5px 5px;
  border: solid 1px;
  border-radius: 5px;
  background-color: #e2e2e2;
}


/*about・link共通*/

.about-logo {
  width: 30%;
}

.return-top {
  display: block;
  width: 6%;
  margin: 10px auto 0 auto;
}

.boat {
  width: 13%;
  margin-top: 10px;
}