*,
*:before,
*:after {
  -webkit-box-sizing: inherit;
  box-sizing: inherit;
}

html {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  font-size: 62.5%;
}

.btn,
a.btn,
button.btn {
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1.5;
  position: relative;
  display: inline-block;
  padding: 2rem 8rem;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  text-align: center;
  vertical-align: middle;
  text-decoration: none;
  letter-spacing: 0.1em;
  color: #212529;
  border-radius: 0.5rem;
}

/*背景*/
.btn-wrap {
  margin: 20px;
}

a.btn-switch {
  color: #333;
  border: 1px solid #fffdfd;
  border-radius: 100vh;
  background: #ffffff;
  background: -webkit-gradient(
    linear,
    left top,
    left bottom,
    from(#ffffff),
    to(#dcddde)
  );
  background: -webkit-linear-gradient(top, #fbfbfc 0%, #dcddde 100%);
  background: linear-gradient(180deg, #fbfbfc 0%, #dcddde 100%);
  -webkit-box-shadow: -1px -5px 6px rgba(0, 0, 0, 0.2), 3px 3px 5px white,
    0 10px 10px rgba(0, 0, 0, 0.1), inset 0 -4px 5px rgba(0, 0, 0, 0.1);
  box-shadow: -1px -5px 6px rgba(0, 0, 0, 0.2), 3px 3px 5px white,
    0 10px 10px rgba(0, 0, 0, 0.1), inset 0 -4px 5px rgba(0, 0, 0, 0.1);
}

a.btn-switch span {
  display: inline-block;

  -webkit-transition: all 0.3s;

  transition: all 0.3s;
}

a.btn-switch:hover {
  -webkit-box-shadow: -1px -5px 6px rgba(0, 0, 0, 0.2), 3px 3px 5px white,
    0 10px 10px rgba(0, 0, 0, 0.1), inset 0 -4px 5px rgba(0, 0, 0, 0.1),
    inset 0 3px 3px rgba(0, 0, 0, 0.18);
  box-shadow: -1px -5px 6px rgba(0, 0, 0, 0.2), 3px 3px 5px white,
    0 10px 10px rgba(0, 0, 0, 0.1), inset 0 -4px 5px rgba(0, 0, 0, 0.1),
    inset 0 3px 3px rgba(0, 0, 0, 0.18);
}

a.btn-switch:hover span {
  -webkit-transform: scale(0.96);
  transform: scale(0.96);
}

h1 {
  position: relative;
  padding: 1.5rem 1.5rem calc(1.5rem + 10px);
  border: 2px solid #000000;;
  text-align: center;}   

h1:after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 10px;
  content: '';
  border-top: 2px solid #000;
  background-image: -webkit-repeating-linear-gradient(135deg, #000, #000 1px, transparent 2px, transparent 5px);
  background-image: repeating-linear-gradient(-45deg, #000, #000 1px, transparent 2px, transparent 5px);
  background-size: 7px 7px;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
h1:first-letter {
  font-size: 2em;
  color: #000000;
}
h1{
  color:#000000;
  font-size: 45px;
}
.balloon-002 {
  display: flex;
  justify-content: center;
  position: relative;
  max-width: 400px;
  margin-top: 15px;
  padding: .8em 1.2em;
  border-radius: 5px;
  background-color: #ffffff;
  color: #333333;
}

.balloon-002::before {
  position: absolute;
  top: -15px;
  width: 15%;
  height: 15px;
  background-color: #feffff;
  clip-path: polygon(50% 0, 0 100%, 100% 100%);
  content: '';
}
body{
  background-repeat: no-repeat; 
  background-size:1300px;
}
.wrapper { 
  height: 100%;
  width: 100%;
  left:0;
  right: 0;
  top: 0;
  bottom: 0;
  position: absolute;
background: linear-gradient(124deg, #ff2400, #e81d1d, #e8b71d, #e3e81d, #1de840, #1ddde8, #2b1de8, #dd00f3, #dd00f3);
background-size: 1800% 1800%;

-webkit-animation: rainbow 18s ease infinite;
-z-animation: rainbow 18s ease infinite;
-o-animation: rainbow 18s ease infinite;
  animation: rainbow 18s ease infinite;}

@-webkit-keyframes rainbow {
    0%{background-position:0% 82%}
    50%{background-position:100% 19%}
    100%{background-position:0% 82%}
}
@-moz-keyframes rainbow {
    0%{background-position:0% 82%}
    50%{background-position:100% 19%}
    100%{background-position:0% 82%}
}
@-o-keyframes rainbow {
    0%{background-position:0% 82%}
    50%{background-position:100% 19%}
    100%{background-position:0% 82%}
}
@keyframes rainbow { 
    0%{background-position:0% 82%}
    50%{background-position:100% 19%}
    100%{background-position:0% 82%}
}