/* ここはコピーしなくてOK　*/
.container {
  text-align: center;
  padding-top: 40px;
  @import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@700&display=swap');
  font-family: 'Noto Sans JP', sans-serif;
}

/* ここから下がボタンのCSS　*/
.btn-circle {
  display: inline-block;
  text-decoration: none;
  color: #FFF;
  font-weight: 700;
  background-color: #000;
  letter-spacing: 1.5px;
  width: 220px;
  text-align: center;
  padding: 24px;
  position: relative;
  opacity: 1 !important;
  transition: all 0.4s;
  overflow: hidden;
  border: none;
}
.btn-circle:before {
  content: "";
  display: block;
  width: 220px;
  height: 220px;
  background-color: #FFF;
  border-radius: 100%;
  position: absolute;
  left: 0;
  bottom: 0;
  transform: translate(-100%, 100%);
  transition: all 0.4s;
  pointer-events: none;
}
.btn-circle:after {
  content: "";
  width: 8px;
  height: 8px;
  background-color: #FFF;
  border-radius: 100%;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: 18px;
  transition: all 0.4s;
}
.btn-circle:hover {
  color: #000;
  box-shadow: 0px 10px 20px rgba(0, 0, 0, 0.2);
}
.btn-circle:hover:after {
  width: 0;
  height: 0;
  border-radius: 0;
  background-color: transparent;
  border-style: solid;
  border-width: 5px 0 5px 6px;
  border-color: transparent transparent transparent #FFF;
  right: 12px;
}
.btn-circle:hover:before {
  transform: translate(-12px, 60px);
}
.btn-circle span {
  position: relative;
  z-index: 99;
}