body {
  background-color: #ddd;
  font-family: Tahoma, Arial, Helvetica, sans-serif;
  font-size: 14px;
}

.my-heading {
  float: right;
  font-size: 24px;
  font-weight: bold;
}

a {
  color: black;
  text-decoration: none;
}
a:hover {
  color: white;
  background-color: DarkRed;
}
a:visited {
  color: black;
}

.btn-folder {
  display: inline-block;
  color: black;
  background-color: PaleGoldenRod;
  width: 250px;
  font-size: 12px;
  font-weight: bold;
  text-align: left;
  border: 1px solid black;
  border-radius: 2px;
  padding: 4px 2px 4px 7px;
  margin-bottom: 5px;
  box-shadow: 3px 3px 3px Gray;
}
.btn-folder:hover {
  color: white;
  background-color: FireBrick;
  box-shadow: none;
}

.btn {
  color: black;
  background-color: PaleGreen;
  font-size: 12px;
  font-weight: bold;
  text-decoration: none;
  padding: 1px 10px;
  border: 1px solid black;
  border-radius: 5px;
  margin-bottom: 5px;
  margin-right: 10px;
}
.btn:hover {
  color: white;
  background-color: DarkGreen;
  box-shadow: 3px 3px 5px gray;
}

.indent {
  margin-left: 30px;
  line-height: 1.9;
}

.cur-folder {
  display: inline-block;
  margin-left: 20px;
}

.rotate-group {
  display: inline-block;
  background-color: white;
  border: 1px solid gray;
  padding: 5px 10px 0px 10px;
  font-size: 11px;
}

.nav-group {
  text-align: center;
  padding: none;
  border-top: 1px solid silver;
}

.nav {
  background-color: white;
  font-size: 14px;
  font-weight: bold;
  text-align: center;
  padding-left: 10px;
  padding-right: 10px;
  margin-left: 5px;
  margin-right: 5px;
  border: 1px solid black;
  border-radius: 5px;
}
.nav:hover {
  color: black;
  background-color: cyan;
}

.file img video {
  transition: transform 0.4s ease-in-out;
}

.arrow {
  display: inline-block;
  cursor: pointer;
  font-size: 14px;
  top: 50%;
  margin-top: -10px;
  width: 0;
  height: 0;
  border-style: solid;
}
.arrow:hover {
  border-color: cyan;
}

#arrow-left {
  border-width: 7px 10px 7px 0;
  border-color: transparent black transparent transparent;
  margin-left: 5px;
  margin-right: 8px;
}

#arrow-right {
  border-width: 7px 0 7px 10px;
  border-color: transparent transparent transparent black;
  margin-left: 8px;
  margin-right: 5px;
}

.slide {
  width: 1000px;
}

.pic {
  margin-top: 5px;
  max-width: 95vw;
  height: 80vh;
  overflow-x: hidden;
}

.no-bullets {
  list-style-type: none;
}

li {
  margin-bottom: 10px;
}

.rotate {
  transform-origin: 50% 50%;
}

video {
  vertical-align: top;
}

.progress-container {
  background: white;
  border: 1px solid black;
  border-radius: 5px;
  cursor: pointer;
  margin: 10px 0;
  height: 10px;
  width: 1000px;
  margin: auto;
}

.progress {
  background-color: Red;
  border-radius: 3px;
  height: 100%;
  width: 0%;
  transition: width 0.1s linear;
}