.c-btn, .c-btn:visited, .c-btn:active, .c-btn:link {
  margin: 0 auto;
  align-items: center;
  color: #000;
  box-sizing: border-box;
  background-color: #fff;
  border: 3px solid #000;
  border-radius: 9999px;
  display: flex;
  font-weight: bold;
  font-size: min(calc(44vw / 7.5), 44px);
  justify-content: center;
  text-align: center;
  height: min(calc(112vw / 7.5), 112px);
  width: min(calc(600vw / 7.5), 600px);
  position: relative;
}
.c-btn:hover {
  text-decoration: none;
  opacity: .5;
}
.c-btn::after {
  content: "";
  display: block;
  position: absolute;
  top: 50%;
  right: 5%;
  width: .5em;
  height: .5em;
  border-top: 2px solid #000;
  border-right: 2px solid #000;
  transform: translateY(-50%) rotate(135deg);
}
@media screen and (min-width: 768px) {
  .c-btn, .c-btn:visited, .c-btn:active, .c-btn:hover, .c-btn:link {
    font-size: 22px;
    height: 56px;
    width: 340px;
  }
  
}