html {
  overflow: -moz-scrollbars-vertical;
  overflow-y: scroll;
}

button {
  display: block;
  width: 200px;
  height: 30px;
  margin: auto;
}

.folderText {
	opacity: 1;
}

.box {
  position: relative;
  margin: 20px auto;
  height: 0px;
  background: #383838 url(images/low_contrast_linen.png);
  box-shadow: inset 0 10px 15px -2px #000;
  -moz-transition: all 0.4s ease;
  -o-transition: all 0.4s ease;
  -webkit-transition: all 0.4s ease;
  transition: all 0.4s ease;
}
.box:before, .box:after {
  content: "";
  position: absolute;
  border: 20px solid rgba(0,0,0,0);
  border-top: none;
  height: 0;
  width: 0;
  left: 50%;
  margin-left: -20px;
}
.box:before {
  border-color: rgba(0,0,0,0) rgba(0,0,0,0) rgba(0,0,0,0);
  top: -20px;
}
.box:after {
  bottom: 0;
  border-color: rgba(0,0,0,0) transparent;
  -moz-transition: all 0.2s ease 0.2s;
  -o-transition: all 0.2s ease 0.2s;
  -webkit-transition: all 0.2s ease;
  -webkit-transition-delay: 0.2s;
  transition: all 0.2s ease 0.2s;
}

.transitionstart:before, .transitionstart:after {
  border-color: rgba(0,0,0,0);
}

.openned {
  height: 250px;
}
/*開啟後的箭頭顏色*/
.openned:before {
  border-color: rgba(0,0,0,0) rgba(0,0,0,0) #000;
}
.openned:after {
  bottom: -20px;
}

.transitionend:after {
  border-color: rgba(0,0,0,0);
}

.showafter:after {
  bottom: 0;
  -moz-transition: all 0s;
  -o-transition: all 0s;
  -webkit-transition: all 0s;
  transition: all 0s;
  border-color: rgba(0,0,0,0) transparent;
}