* {box-sizing: border-box}

/* Set height of body and the document to 100% */
body, html {
  height: 100%;
  margin: 0;
  font-family: Arial;
}

.butbg{
  position: relative;
  height: 160px;
  background: url(../img/d01-1.png) left top no-repeat;
}

.buts{
  position: absolute;
  bottom: 1em;
  width: 75%;
  right: 0;
}

.butsph{
  width: 80%;
  margin: 0 auto;
}

/* Style tab links */
.tablink {
  background-color: transparent;
  color: white;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
 /*  padding: 14px 16px; */
  font-size: 17px;
  width: 25%;
  transform: scale(1,1);
  transition: .5s;
}

.tablink:hover {
  transform: scale(1.1,1.1);
}

/* Style the tab content (and add height:100% for full page content) */
#Home {background-color: white;}
#News {background-color: white;}
#Contact {background-color: white;}
#About {background-color: white;}
button:focus{outline: none !important;}

@media all and (max-width:425px) {
  .tablink {
    float: none;
    width: 44%;
  }
}
/*------------ YouTube嵌入 -----------------*/
.video-container {
  position: relative;
  padding-bottom: 56.25%;
  padding-top: 30px;
  height: 0;
  overflow: hidden;
  }
  /*padding-bottom:56.25%; 為影片高度與寬度的比例16:9計算得來，9除以16=0.5625換算高度比0.5625=56.25% */
  /*padding-top: 30px; 用於修正的高度，可用25px或30px */
  .video-container iframe{
  position: absolute;
  top: 0;left: 0;
  width: 100%;
  height: 100%;
  }
  /*------------ #YouTube嵌入 -----------------*/




/*-------------------------------------------- 分開 --------------------------------------------*/


/* Set height of body and the document to 100% */
body, html {
  height: 100%;
  margin: 0;
  font-family: Arial;
}

/* Style tab links */
.tablink2 {
  background-color: transparent;
  color: white;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 14px 16px;
  font-size: 17px;
  width: 50%;
  transform: scale(1,1);
  transition: .5s;
}
.tablink2:hover {
  transform: scale(1.1,1.1);
}
/* .tablink:hover {
  background-color: #777;
}
 */
/* Style the tab content (and add height:100% for full page content) */
.tabcontent2 {
  color: white;
  display: none;
  padding: 0em 0em;
  height: 100%;
}

#Lecture {background-color: white;}
#Lecture2 {background-color: white;}
#Contact {background-color: white;}
#About {background-color: white;}
button:focus{outline: none !important;}


.bbut{
    position: relative;
    padding: 2em 0em;
}
.bbuts{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50%;
}
@media (max-width: 425px){
  .bbuts{width: 70%;}
  .bbut{padding: 1em 0em;}
}