.nav h3 {
  color: #337ab7;
  /*cursor: pointer;*/
  line-height: inherit;
  font-size: 14px;
  margin: 0;
  padding: 10px 15px 0 15px;
  text-align: center;
  font-weight: bold;
  border-top: dashed 1px #337ab7;
  letter-spacing: 0.2em;

}

.nav li {
  /*text-indent: .5em;*/
}

.nav li:first-child {
  text-indent: 0;
}

.tab-content p {
  text-indent: 0;
  line-height: 1.5;
}

.p4img-b,.p4img-m,.p4img-s {
  text-align: center;
}

.p4img-b {
  margin: 10px auto;
  max-width: 680px;
}

.p4img-1, .p4img-2, .p4img-3, .p4img-4, .p4img-5, .p4img-6, .p4img-max {
  margin: 0 4%;
}

.p4img-1 {
  max-width: 250px;
}

.p4img-2 {
  max-width: 300px;
}

.p4img-3 {
  max-width: 350px;
}

.p4img-4 {
  max-width: 400px;
}

.p4img-5 {
  max-width: 450px;
}

.p4img-6 {
  max-width: 500px;
}

.p4img-max {
  max-width: 100%;
}