@charset "utf-8";

/*
 * ボタン共通設定
 */
.btn{
  position: relative;
  overflow: hidden;
  text-decoration: none;
  display: inline-block;
  border: 1px solid #555;
  padding: 5px 30px;
  margin: 5px 5px;
  text-align: center;
  outline: none;
  border-radius: 10px;
  transition: ease .2s;
}

/*ボタン内spanの形状*/
.btn span {
  position: relative;
  z-index: 3;
  color:#333;
}

.btn:hover span {
  color:#fff;
}

.bgcenterx:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  background: #333;
  width: 100%;
  height: 100%;
  transition: transform .1s cubic-bezier(0.8, 0, 0.2, 1) 0s;
  transform: scale(0, 1);
  transform-origin: top;
}

.bgcenterx:hover:before {
  transform:scale(1, 1);
}