@charset "UTF-8";

body {
  color: black;
  font-size: 18px;
  background-color: #FFFFA5;
}
a {
  text-decoration: none;
}
img {
  max-width: 100%;
}
li{
  list-style: none;
}
.section-title {
  display: inline-block;
  font-size: 24px;
  text-align: center;
  margin-bottom: 45px;
}
.wrapper {
  max-width: 960px;
  margin: 0 auto 100px auto;
  padding: 0 4%;
  text-align: center;
}

/*-------------------------------------------
ヘッダー
-------------------------------------------*/
#header {
  background-color: #00A834;
}
.header-inner{
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 auto;
}
.site-title {
  line-height: 1px;
  padding: 10px 0;
}
.site-title a {
display: block;
color: #fff;
font-size: 23px;
}
.header-inner ul {
  display: flex;
  padding: 20px 0;
}
.header-inner li {
  margin-left: 30px;
}
.header-inner li a {
  color: #fff;
  font-size: 18px;
}
.header-inner li a:hover {
  opacity: 0.7;
}

/*-------------------------------------------
Mainvisual
-------------------------------------------*/
#mainvisual {
  margin-bottom: 80px;
}
#mainvisual img {
  width: 100%;
  max-width: 1920px;
  height: 600px;
  object-fit: cover;
}


/*-------------------------------------------
movie
-------------------------------------------*/
/*-------------------------------------------
ーボタン
-------------------------------------------*/
*,
*:before,
*:after {
  -webkit-box-sizing: inherit;
  box-sizing: inherit;
}

.btn,
a.btn,
button.btn {
  font-size: 1rem;
  font-weight: 700;
  <a href=""
     class="btn btn-css">
  <div class="midashi">CSS</div>Webページ<br>デザイン

</section>

</main>

</body>

</html>

  line-height: 1.5;
  position :relative;
  display:inline-block;
  padding:1rem 2rem;
  width: 12rem; /*ボタンの横幅*/
  margin: 0.2rem; /*余白*/
  cursor: pointer;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  text-align: center;
  vertical-align: middle;

  letter-spacing: 0.1em;
  border-radius: 0.5rem;
}

/*-------------------------------------------
ーボタンそれぞれ
-------------------------------------------*/
.midashi{font-size: 1.5rem;}

.btn-html, /*------------------html------------------*/
a.btn-html {
  color: #fff;
  background-color: #eb6100;
}
.btn-html:hover,
a.btn-html:hover {
  color: #fff;
  background: #f57920;
}

.btn-css,/*-------------------css---------------------*/
a.btn-css {
  color: #fff;
  background-color: #4aeb00;
}
.btn-css:hover,
a.btn-css:hover {
  color: #fff;
  background: #69f628;
}




/*-------------------------------------------
footer
-------------------------------------------*/
#footer {
  font-size: 16px;
  padding: 20px 0;
  text-align: center;
  background-color: #00A834;
}

/*-------------------------------------------
SP
-------------------------------------------*/
@media screen and (max-width: 600px) {
  body {
    font-size: 15px;
  }
  /*-------------------------------------------
ヘッダー
-------------------------------------------*/
.site-title a {
font-size: 15px;
}
.header-inner ul {
  padding: 10px 0;
}
.header-inner li a {
  font-size: 14px;
}

}