body {
  font-family: "IRANSansX", sans-serif;
  background: #f8f9fa;
  margin: 0;
  padding: 0;
}
.fa-num {
  -moz-font-feature-settings: "ss02";
  -webkit-font-feature-settings: "ss02";
  font-feature-settings: "ss02";
}

nav.navbar {
  position: fixed;
  width: 100vw;
  top: 0;
  right: 0;
  z-index: 10;
  
}

nav .container {
  height: 3em;
  position: relative;
}
nav img {
  height: 100%;
}

@media (max-width: 640px) {
  nav img {
    max-width: 25%;
    height: auto;
  }
  .navbar .btn-outline-primary{
    font-size: 0.7em;
  }
}

nav .btn{
  z-index: 2

}

.navbar-brand {
  font-weight: 900;
  position: absolute;
  width: 100%;
  text-align: center;
}

.navbar + .container {
  margin-top: 6em !important;
}

.ltr {
  text-align: left;
}

mjx-container.MathJax {
    font-size: 1.3em;
    font-weight: 900;
}

.hidden {
  display: none;
}