#page {
  /*
  border: 3px solid #aaa;
  padding-top: 25px;
  margin: 40px auto;
  padding-bottom: 20px;
  */
  padding: 15px;
  margin-bottom: 40px;
  background-color: white;
  width: 80%;
  min-width: 340px;
}

div.thumbnails {
  display: flex;
  flex-wrap: wrap;
  /*
  justify-content: space-evenly;
  */

}

div.thumbnail {
  width: 300px;
  padding: 4px;
  margin-right: 20px;
  margin-bottom: 20px;
  /*
  border: 1px solid #ddd;
  */
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.055)
}

div.last-thumbnail {
  margin-right: 0;
}

div.thumbnail img {
  margin-left: auto;
  margin-right: auto;
  display: block;
}

div.thumbnail p {
  font-size: 0.9rem;
}

div.sheet-body {
  display: flex;
  flex-wrap: wrap;
}

div.problems {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  flex: 5;
}

@media (min-width: 500px) {
  div.problems {
  justify-content: flex-start;
  }
}

div.sheet-sidebar {
  min-width: 160px;
  flex: 1;
}

div.problem {
  /*
  border: 3px solid #888;
  */
  margin: 20px;
  padding: 15px;
  position: relative;
  background-color: #fff;
}

div.eqn {
  font-size: 2em;
  text-align: center;
}

input.guess {
  width: auto;
}

input.correct-answer {
  background-color: #afa;
}

#title {
  text-align:center;
  font-size:2em;
  font-weight:bold;
  font-family:sans;
  color: #fff;
}

.problem-targetable:hover {
  padding: 13px;
  border: 2px solid #DDD;
}

.targeting {
  cursor: url(/images/crosshair.png) 40 40, crosshair;
}

div.prev-next {
/*
  padding: 20px 20px
*/
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
}

div.just-next {
  padding-top: 20px;
  display: flex;
  justify-content: flex-end;
}

#students-tbl {
  width: auto;
}

#students-tbl .progress {
/*
  */
  width: 100px;
  margin-right: 20px;
}

div.progress {
  margin-bottom: 20px;
}

#students-tbl .pw_col {
  display: none;
}

#students-tbl i {
  margin-left: 10px;
}

@media (max-width: 767px) {
  #students-tbl td:nth-child(3),th:nth-child(3) {
    display: none;
  }
  #students-tbl td:nth-child(5),th:nth-child(5) {
    display: none;
  }
}
@media (min-width: 768px) {
  div.hero-unit h1 {
    font-size: 4.5rem;
    font-weight: 300;
    line-height: 1.2;
  }
}

div.student-details {
  display: inline-grid;
  grid-template-columns: auto auto;
}

div.detail-label {
  font-weight: bold;
  text-align: right;
}

div.detail-value {
  padding-left: 10px;
}

.hidden {
  display: none;
}

.spinner {
  width: 100px;
}

.hero-unit {
  padding: 60px;
  margin-top: 20px;
  margin-bottom: 30px;
  background-color: #eeeeee;
  border-radius: 6px;
}