#container {
  width: 100%;
  margin: auto;
  text-align: center;
}
body {
  background-color: yellow;
}

#eq_input {
  width: 30%;
  background-color: rgb(206, 224, 40);
  border: 1px solid transparent;
  padding: 10px;
  font-size: 16px;
}

#eq_submit {
  background-color: #0af316;
  border: none;
  color: white;
  text-align: center;
  padding: 10px;
  font-size: 16px;
  text-decoration: none;
}

.option_in {
  width: 50px;
  margin-bottom: 10px;
}

.mathjax {
  width: 50%;
  overflow-x: auto;
  overflow-y: hidden;
  margin: auto;
  width: 100%;
  font-size: 2em;
}

li {
  margin-top: 10px;
}

.title {
  margin: auto;
  width: 30%;
}

.subtitle {
  margin: auto;
  width: 20%;
  font-size: 0.8em;
}

/* lines to the left and right of subtitle */
.subtitle:before,
.subtitle:after,
.title:before,
.title:after {
  content: "";
  display: inline-block;
  width: 50%;
  margin: 0 0.5em 0 -55%;
  vertical-align: middle;
  border-bottom: 1px solid;
}

.subtitle:after,
.title:after {
  margin: 0 -55% 0 0.5em;
}

#results {
  list-style-type: none; /* hide bullets */
  padding: 0; /* remove indent */
}

#graph_view {
  display: flex;
  justify-content: center;
  position: relative;
}

#graph {
  display: none;
  width: 500px;
  height: 500px;
}

#graph_options {
  position: absolute;
  left: 65%;
  list-style-type: none;
  padding: 0;
  vertical-align: top;
}

#graph,
#graph_options {
  justify-content: flex-start;
}

#graph_overlay {
  display: none;
  position: absolute;
  width: 500px;
  height: 500px;
  background-color: rgba(7, 247, 7, 0.7);
}

#graph_overlay_text {
  display: none;
  font-size: 1.3em;
  vertical-align: middle;
}

.error {
  color: #c70039;
  font-size: 1.3em;
}

.option_li {
  text-align: left;
}