#ptbl{
       margin:0 0 -10px 0;
       height:26px; 
       opacity:0.7;
      }
      #ptbl:hover {
      opacity:1.0;
}      
      
.formula {
  color:#007711;
  font-size:15px;
  line-height:18px;
}

.gray {
	color:#888888;
}

.serif {
font-family:Times,"Times New Roman", serif;
font-size: 16px;
}




@media (max-width: 768px) {
  .video-container { 
   position: relative; /* keeps the aspect ratio */ 
   padding-bottom: 56.25%; /* fine tunes the video positioning */ 
   padding-top: 60px; overflow: hidden;
}

.video-container iframe,
.video-container object,
.video-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
}


.menu1 {
font-weight: bold;
font-size: 120%;
margin: 2px 2px 2px 5px;
}

.badge-mod {
  display: inline-block;
  min-width: 10px;
  padding: 4px 8px;
  font-size: 16px;
  font-weight: bold;
  line-height: 1;
  color: #ffffff;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  background-color: #000000;
  opacity: 0.3;
  border-radius: 12px;
}

.mathtype {
 font-family: "New Times Roman", "Times", serif;
 font-size: 120%;
 font-style: italic; 
}