html, body {
  height: 100vh;
  font-family: "Source Sans Pro", sans-serif;
  padding: 0;
  margin: 0;
  --menu-position-top: 4rem;
  --menu-position-right: auto;
  --menu-text-color: white;
  --menu-background-color: #800080;
  --menu-item-background-color: #440044;
  --menu-item-border-color: #e5e0f0;
}

/* Header */
.e4f-header {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  height: 4rem;
  width: 100%;
  background-color: purple;
}

.e4f-header > * {
  flex: 1 1 auto;
}

.e4f-header section:first-child, .e4f-header section:last-child {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 35%;
  height: 100%;
}

.e4f-logo {
  display: inline-block;
  height: 3.25rem;
  width: 5rem;
  text-align: center;
  background:
    linear-gradient(to right, rgba(255, 255, 255, .5), rgba(255, 255, 255, .5)),
    linear-gradient(
      45deg,
      rgba(255, 0, 0, 1) 0%,
      rgba(255, 154, 0, 1) 10%,
      rgba(208, 222, 33, 1) 20%,
      rgba(79, 220, 74, 1) 30%,
      rgba(63, 218, 216, 1) 40%,
      rgba(47, 201, 226, 1) 50%,
      rgba(28, 127, 238, 1) 60%,
      rgba(95, 21, 242, 1) 70%,
      rgba(186, 12, 248, 1) 80%,
      rgba(251, 7, 217, 1) 90%,
      rgba(255, 0, 0, 1) 100%
    );
}

.e4f-logo a {
  display: flex;
  justify-content: center;
  flex-direction: column;
  height: 100%;
  color: darkslategray;
  line-height: 1rem;
  font-weight: 600;
  text-decoration: none;
}

.e4f-page-title {
  color: white;
  font-size: 1.25rem;
  font-weight: normal;
  text-align: center;
  margin: auto;
}

.e4f-contact {
  float: right;
  text-align: center;
  line-height: 2rem;
  border-radius: .25rem;
  margin-right: 1rem;
  cursor: pointer;
}

.e4f-contact a {
  display: flex;
  justify-content: center;
  align-items: center;
  color: rgb(40, 220, 100);
  font-size: 1.6rem;
  text-decoration: none;
}

@media (min-width: 500px) {
  .e4f-header section:first-child, .e4f-header section:last-child {
    width: 25%;
  }

  .e4f-logo {
    margin-left: 1rem;
  }

  .e4f-page-title {
    font-size: 1.6rem;
  }

  .e4f-contact {
    position: relative;
    margin-right: 1rem;
  }

  .e4f-contact::before {
    content: attr(data-tooltip);
    display: none;
    position: absolute;
    left: -3.75rem;
    top: 31px;
    width: 5.5rem;
    color: white;
    background-color: darkslategray;
    font-size: .85rem;
    text-align: center;
    border-radius: .25rem;
  }

  .e4f-contact::after {
    content: "";
    display: none;
    position: absolute;
    left: 3px;
    top: 12px;
    border: 10px solid;
    border-color: transparent transparent darkslategray transparent;
  }

  .e4f-contact:hover::before, .e4f-contact:hover::after {
    display: block;
  }
}


@media (min-width: 850px) {  
  .e4f-logo {
    width: 8rem;
    margin-left: 2rem;
  }

  .e4f-logo a {
    font-size: 1.1rem;
  }

  .e4f-page-title {
    font-size: 2rem;
  }

  .e4f-contact {
    margin-right: 2rem;
  }
}

/* Main */
.content-container {
  min-height: calc(100vh - 4rem);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.e4f-breadcrumbs {
  list-style: none;
  padding: 0;
}

.e4f-breadcrumb-item {
  display: inline;
}

.e4f-breadcrumb-item i {
  font-size: .75rem;
  color: #6c757d;
  padding-left: .25rem;
  padding-right: .25rem;
}

.e4f-breadcrumb-item a.current {
  color: #000000;
  text-decoration: none;
  cursor: text;
}

.e4f-image-gallery {
  display: none;
  flex-wrap: wrap;
  gap: 1rem;
  width: 254px;
  margin: 0 auto;
}

.e4f-image-gallery h2 {
  text-align: center;
}

.e4f-image-gallery h2::after {
  margin-left: .5rem;
}

.e4f-image-gallery div:not(.collapsible) h2 {
  margin-top: 0;
}

.e4f-gallery-sy {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  width: 100%;
  padding-top: .125rem;
}

.e4f-card {
  height: 15.75rem;
  width: 15.75rem;
  border: 1px solid lightgray;
}

.e4f-card a,
.e4f-card a:link,
.e4f-card a:visited, 
.e4f-card a:hover, 
.e4f-card a:active {
  color: purple;
}

.e4f-card-title {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 25%;
  border-bottom: 1px solid lightgray;
}

.e4f-card-title h3 {
  text-align: center;
  margin: 0;
}

.e4f-card-body img {
  height: 11.8125rem;
  width: 15.75rem;
}

@media (min-width: 576px) {
  .e4f-image-gallery {
    width: 524px;
  }
}

@media (min-width: 992px) {
  .e4f-image-gallery {
    width: 794px;
  }
}

@media (min-width: 1200px) {
  .e4f-image-gallery {
    width: 1064px;
  }
}