cover.css

/*
 * Globals
 */

/* Links */
a,
a:focus,
a:hover {
  color: gray;
}

/* Custom default button */
.btn-secondary,
.btn-secondary:hover,
.btn-secondary:focus {
  color: #333;
  text-shadow: none; /* Prevent inheritance from `body` */
  background-color: #fff;
  border: .05rem solid #fff;
}


/*
 * Base structure
 */

html,
body {
  background-color: white;
}

body {
  display: -ms-flexbox;
  display: flex;
  color: black;
  box-shadow: inset 0 0 5rem rgba(0, 0, 0, .25);
}

.cover-container {
  max-width: 90%;
}
.container {
  margin-top: 20px;
  height: auto;
}

/*
 * Header
 */
.masthead {
  margin-bottom: 2rem;
}

.masthead-brand {
  margin-bottom: 0;
}

.nav-masthead .nav-link {
  padding: .25rem 0;
  font-weight: 700;
  background-color: transparent;
  border-bottom: .25rem solid transparent;
    border-bottom-color: lightgray;
  color: #525252;
}

.nav-masthead .nav-link:hover,
.nav-masthead .nav-link:focus {
  border-bottom-color: grey;
  color: black;