BUTTONボタン

• ボタン：ベース

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  a.link {
  font-size: 1.6rem;
  font-size: 16px;
  font-weight: bold;
  position: relative;
  display: inline-block;
  padding: 1rem 4rem;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: all 0.3s;
  text-align: center;
  vertical-align: middle;
  text-decoration: none;
  letter-spacing: 0.1em;
  }
  
  a.link-flat{
  overflow: hidden;
  padding: 1rem 6rem;
  color: #fff;
  background: #000;
  position: relative;
  }
  
  a.link-flat::after {
  content: '';
  font-family: "Font Awesome 5 Free";
  content: "\f054";
  font-weight: 900;
  padding-right: 5px;
  color: #fff;
  position: absolute;
  right: 10px;
  -webkit-transition: all .3s ease-in-out;
  transition: all .3s ease-in-out;
  }
  
  a.link-flat span {
  position: relative;
  }
  
  a.link-flat:hover {
  background: #0090d5;
  }
  
  a.link-flat:hover::after {
  right: 0;
  }

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上記のボタン：ベースにコードを追記して使用する。

• ボタン：左から右へ（水平）

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  a.link-flat::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  content: '';
  -webkit-transition: all .3s ease-in-out;
  transition: all .3s ease-in-out;
  -webkit-transform: translateX(-100%);
  transform: translateX(-100%);
  background: #0090d5;
  }
  
  a.link-flat:hover::before {
  -webkit-transform: translateX(0%);
  transform: translateX(0%); 
  }

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• ボタン：左から右へ（斜め）

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  a.link-flat::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  content: '';
  -webkit-transition: all .3s ease-in-out;
  transition: all .3s ease-in-out;
  -webkit-transform: translateX(-100%);
  transform: translateX(-100%);
  background: #0090d5;
  }
  
  a.link-flat:hover::before {
  -webkit-transform: translateX(0%);
  transform: translateX(0%); 
  }

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• ボタン：左から右へ（円形）

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  a.link-flat::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 100px;
  height: 100px;
  content: '';
  -webkit-transition: all .5s ease-in-out;
  transition: all .5s ease-in-out;
  -webkit-transform: translateX(-100%) translateY(-25px);
  transform: translateX(-100%) translateY(-25px);
  background: #0090d5;
  border-radius: 50%; 
  }
  
  a.link-flat:hover::before {
  width: 400px;
  height: 400px;
  -webkit-transform: translateX(-1%) translateY(-175px);
  transform: translateX(-1%) translateY(-175px);
  }

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• ボタン：グラデーション

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  a.link-flat {
  position:relative;
  z-index:0;
  }
  
  a.link-flat::before{
  content:"";
  width:100%;
  height:100%;
  position:absolute;
  z-index:-1;
  left:0;
  top: 0;
  transition:0.5s;
  background: linear-gradient(45deg, rgba(0,144,213,1) 0%, rgba(0,0,0,1) 100%);
  }
  
  a.link-flat::after{
  content:"";
  width:100%;
  height:100%;
  position:absolute;
  z-index:-2;
  left:0;
  top: 0;
  background: linear-gradient(45deg, rgba(0,0,0,1) 0%, rgba(0,144,213,1) 100%);
  }
  
  a.link-flat:hover::before{
  opacity:0;
  }

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• トップへ戻るボタン：四角

  .square-up{
  /*
  画面右端下に追従させるための表記
  position: fixed;
  right: 10px;
  bottom: 10px;
  */
  font-size: 2.5rem;
  background: #fff;
  color: #000;
  padding: 10px;
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  border: solid 2px #000;
  transition: 0.3s;
  }
  
  .square-up div{
  display: block;
  margin-top: 10px;
  width: 20px;
  height: 16px;
  border-top: 2px solid #000;
  border-left: 2px solid #000;
  transform: rotate(45deg);
  }
  
  .square-up:hover{
  box-shadow: 0 2px 10px -6px rgba(0,0,0,.5), 0 3px 10px -4px rgba(0,0,0,.2);
  background: #000;
  color: #fff;
  }
  
  .square-up:hover div{
  border-top: 2px solid #fff;
  border-left: 2px solid #fff;
  }
  

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• トップへ戻るボタン：丸

  .circle-up{
  font-size: 2.5rem;
  background: #fff;
  color: #000;
  padding: 10px;
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  border: solid 2px;
  border-radius: 50%;
  transition: 0.3s;
  }
  
  .circle-up:hover{
  box-shadow: 0 2px 10px -6px rgba(0,0,0,.5), 0 3px 10px -4px rgba(0,0,0,.2);
  }
  

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• トップへ戻るボタン：矢印

  TOP

  .arrow-up{
  display: flex;
  justify-content: center;
  padding-left: 3rem;
  height: 50px;
  width: 65px;
  text-decoration: none;
  font-weight: bold;
  transform: rotate(90deg);
  font-size: 90%;
  line-height: 2rem;
  color: #737373;
  }
  
  .arrow-up::before{
  content: "";
  display: block;
  position: absolute;
  top: -1px;
  left: 0px;
  width: 15px;
  border-top: solid 1px;
  transform: rotate(35deg);
  transform-origin: left top;
  transition: 0.3s;
  }
  
  .arrow-up::after{
  content: "";
  display: block;
  position: absolute;
  height: 50px;
  width: 65px;
  top: -1px;
  right: 1px;
  border-top: solid 1px;
  transition: 0.3s;
  }
  
  .arrow-up:hover::before{
  transform: rotate(35deg) translateX(-6px) translateY(5px);
  }
  
  .arrow-up:hover::after{
  transform: translateX(-8px);
  }
  

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• トップへ戻るボタン：シンプル

  .simple-up{
  width: 40px;
  background: none;
  color: #000;
  border-top: 3px solid #000;
  display: block;
  }
  
  simple-up::before{
  display:none;
  }
  
  simple-up::after{
  content:"↑";
  display:block;
  text-align:center;
  padding-top:0.5rem;
  font-size:30px;
  transition: 0.3s;
  }
  
  simple-up:hover::after{
  transform: translateY(-8px);
  }
  

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• トップへ戻るボタン：文字

  TOP PAGE

  .font-up{
  font-size: 1.6rem;
  background: #000;
  color: #fff;
  padding: 0.5rem 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  border: solid 2px #000;
  transition: 0.3s;
  }
  .font-up:hover{
  box-shadow: 0 2px 10px -6px rgba(0,0,0,.5), 0 3px 10px -4px rgba(0,0,0,.2);
  background: #fff;
  color: #000;
  }
  

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