.btn-light,
.btn-light:hover,
.btn-light:focus {
  color: #333;
  text-shadow: none;
}

body {
  background-image: radial-gradient(ellipse at center, #19882c 10%, #025310 90%);
  text-shadow: 0 .05rem .1rem rgba(0, 0, 0, .5);
  box-shadow: inset 0 0 5rem rgba(0, 0, 0, .5);
}

.cover-container {
  max-width: 42em;
}

.nav-masthead .nav-link {
  color: rgba(255, 255, 255, .5);
  border-bottom: .25rem solid transparent;
}

.nav-masthead .nav-link:hover,
.nav-masthead .nav-link:focus {
  border-bottom-color: rgba(255, 255, 255, .25);
}

.nav-masthead .nav-link + .nav-link {
  margin-left: 1rem;
}

.nav-masthead .active {
  color: #fff;
  border-bottom-color: #fff;
}

.main {
  max-height: 80%;
  padding: 0px;
}

img {
  width: auto;
  height: auto;
  max-width: 100%;
}

.div_main {
  max-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: darkgray;
}

.div_main::-webkit-scrollbar {
  width: 5px;
  height: 5px;

}

.div_main::-webkit-scrollbar-track {
  background: transparent;
  padding: 2px;
  border-radius: 10px;
}

.div_main::-webkit-scrollbar-corner {
  border-radius: 10px;
}

.div_main::-webkit-scrollbar-thumb {
  background-color: darkgray;
  border-radius: 10px;
}