element.style {
  display: none;
}
<style>…</style>#MathJax_Message {
  position: fixed;
  left: 1em;
  bottom: 1.5em;
  background-color: #E6E6E6;
  border: 1px solid #959595;
  margin: 0px;
  padding: 2px 8px;
  z-index: 102;
  color: black;
  font-size: 80%;
  width: auto;
  white-space: nowrap;
}
* {
  margin: 0;
  padding: 0;
}
user agent stylesheetdiv {
  display: block;
}
Inherited from 
body {
  color: #000;
  background-color: #e6e6e6;
  font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
  font-size: 12px;
  min-height: 101%;
}
body {
  font-family: Helvetica,Verdana,Arial,sans-serif;
}


position‒
12margin‒
‒border1
1padding2
8auto × auto8
21
1‒
‒‒
18

Show inherited properties
background-color: rgb(230, 230, 230);
border-bottom-color: rgb(149, 149, 149);
border-bottom-style: solid;
border-bottom-width: 1px;
border-image-outset: 0px;
border-image-repeat: stretch;
border-image-slice: 100%;
border-image-source: none;
border-image-width: 1;
border-left-color: rgb(149, 149, 149);
border-left-style: solid;
border-left-width: 1px;
border-right-color: rgb(149, 149, 149);
border-right-style: solid;
border-right-width: 1px;
border-top-color: rgb(149, 149, 149);
border-top-style: solid;
border-top-width: 1px;
bottom: 18px;
color: rgb(0, 0, 0);
display: none;
font-family: 'Helvetica Neue', Helvetica, Verdana, Arial, sans-serif;
font-size: 12px;
height: auto;
left: 12px;
margin-bottom: 0px;
margin-left: 0px;
margin-right: 0px;
margin-top: 0px;
padding-bottom: 2px;
padding-left: 8px;
padding-right: 8px;
padding-top: 2px;
position: fixed;
white-space: nowrap;
width: auto;
z-index: 102;