.btn {
  display: inline-block;
  width: 17.6vw;
  height: 2.8vw;
  text-align: center;
  text-decoration: none;
  line-height: 3.3;
  outline: none;
  position: relative;
  z-index: 2;
  border: 1px solid #333;
  color: #333;
  -webkit-perspective: 300px;
  perspective: 300px;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}
.btn:hover {
  color: #fff;
}
.btn:hover::after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-transition: all .4s;
  transition: all .4s;
  -webkit-transform: rotateX(0);
  transform: rotateX(0);
  opacity: 0.7;
}
.btn::after {
  position: absolute;
  z-index: -1;
  display: block;
  content: '';
  border: 0;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  -webkit-transform-origin: center top;
  transform-origin: center top;
  -webkit-transform: rotateX(90deg);
  transform: rotateX(90deg);
  opacity: 0;
}

.button_mail {
  display: inline-block;
  width: 560px;
  height: 60px;
  text-align: center;
  text-decoration: none;
  line-height: 54px;
  outline: none;
  position: relative;
  z-index: 2;
  font-size: 16px;
  color: #fff;
  background: #333;
  line-height: 60px;
  -webkit-perspective: 300px;
  perspective: 300px;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}
.button_mail:hover {
  color: #333;
}
.button_mail:hover::after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-transition: all .4s;
  transition: all .4s;
  -webkit-transform: rotateX(0);
  transform: rotateX(0);
  opacity: 1;
  border: 1px solid #333;
}
.button_mail::after {
  position: absolute;
  z-index: -1;
  display: block;
  content: '';
  border: 0;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #fff;
  -webkit-transform-origin: center top;
  transform-origin: center top;
  -webkit-transform: rotateX(90deg);
  transform: rotateX(90deg);
  opacity: 0;
}

.button_biz {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-transition: all .3s;
  transition: all .3s;
  display: inline-block;
  width: 560px;
  height: 60px;
  text-align: center;
  text-decoration: none;
  line-height: 54px;
  outline: none;
  position: relative;
  z-index: 2;
  color: #fff;
  line-height: 50px;
}
.button_biz:hover {
  background-color: #6bbc64;
  opacity: .8;
  color: #fff;
}
.button_biz::before, .button_biz::after {
  top: 0;
  width: 50%;
  height: 100%;
  position: absolute;
  z-index: -1;
  display: block;
  content: '';
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-transition: all .4s;
  transition: all .4s;
}
.button_biz::before {
  right: 0;
}
.button_biz::after {
  left: 0;
}
.button_biz:hover::before, .button_biz:hover::after {
  width: 0;
  background-color: #6bbc64;
}

.btn_01 {
  display: inline-block;
  width: 30%;
  height: auto;
  text-align: center;
  text-decoration: none;
  line-height: 54px;
  outline: none;
  background-color: rgba(0, 0, 0, 0.75);
  color: #fff;
}
.btn_01:hover {
  background-color: #cbbca4;
}
.btn_01::before, .btn_01::after {
  position: absolute;
  z-index: -1;
  display: block;
  content: '';
}

.btn_01, ::before, ::after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-transition: all .3s;
  transition: all .3s;
}

.btn_02 {
  display: inline-block;
  width: 45%;
  height: auto;
  text-align: center;
  text-decoration: none;
  line-height: 54px;
  outline: none;
  background-color: rgba(0, 0, 0, 0.75);
  color: #fff;
}
.btn_02:hover {
  background-color: #fff;
  border-color: #cbbca4;
  color: #cbbca4;
}
.btn_02::before, .btn_02::after {
  position: absolute;
  z-index: -1;
  display: block;
  content: '';
}

.btn_02, ::before, ::after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-transition: all .3s;
  transition: all .3s;
}

.btn_03 {
  position: relative;
  display: inline-block;
  z-index: 2;
  width: 45%;
  height: auto;
  text-align: center;
  text-decoration: none;
  border: 2px solid #fff;
  line-height: 54px;
  outline: none;
  background-color: rgba(0, 0, 0, 0.75);
  color: #fff;
}
.btn_03:hover {
  border: 2px solid #fff;
}
.btn_03::after {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 80%;
  height: 30%;
  border: 2px solid #fff;
  opacity: 0;
}
.btn_03:hover .btn_03::after {
  opacity: 1;
}

.btn_03, ::before, ::after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-transition: all .3s;
  transition: all .3s;
}