master.css

html, body {
    background-image: url("back.jpg");
    background-repeat: no-repeat;
    background-size: cover;
}

.navbar .navbar-expand-md .navbar-dark {
    text-align: center !important;
    float: none !important;
}

.bg-dark {
    background-color: #8BC34A !important;
}

.border-dark {
    border-color: #8BC34A !important;
}

.btn-dark {
    background-color: #8BC34A !important;
    border-color: #8BC34A !important;
    color: #FFFFFF !important;
}

.nav-pills>li.nav-item>a {
    color: #8BC34A !important;
}

.nav-pills>li.nav-item>a.active {
    background-color: #8BC34A !important;
    color: #FFFFFF !important;
}

.nav-pills>li.nav-item>a.active:focus, .nav-pills>li.nav-item>a.active:hover {
    color: #FFFFFF !important;
}

.nav-tabs>li.nav-item>a {
    color: #FFFFFF !important;
}

.nav-tabs>li.nav-item>a.active {
    background-color: #FFFFFF !important;
    color: #8BC34A !important;
}

.nav-tabs>li.nav-item>a.active:focus, .nav-tabs>li.nav-item>a.active:hover {
    color: #8BC34A !important;
}

.loader {
  border: 16px solid #f3f3f3;
  border-radius: 50%;
  border-top: 16px solid blue;
  border-right: 16px solid green;
  border-bottom: 16px solid red;
  width: 20px;
  height: 20px;
  margin-left: auto;
  margin-right: auto;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
}

@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.quote-card.blue-card {
  background: #0078FF;
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(34, 34, 34, 0.12), 0 2px 4px rgba(34, 34, 34, 0.24);
}

.quote-card {
  background: #fff;
  color: #222222;
  padding: 20px;
  padding-left: 50px;
  box-sizing: border-box;
  box-shadow: 0 2px 4px rgba(34, 34, 34, 0.12);
  position: relative;
  overflow: hidden;
  min-height: 120px;
}

.quote-card p {
  font-size: 22px;
  line-height: 1.5;
  margin: 0;
  max-width: 80%;
}
.quote-card cite {
  font-size: 16px;
  margin-top: 10px;
  display: block;
  font-weight: 200;
  opacity: 0.8;
}
.quote-card:before {
  font-family: Georgia, serif;
  content: "“";
  position: absolute;
  top: 10px;
  left: 10px;
  font-size: 5em;
  color: rgba(238, 238, 238, 0.8);
  font-weight: normal;
}
.quote-card:after {
  font-family: Georgia, serif;
  content: "”";
  position: absolute;
  bottom: -110px;
  line-height: 100px;
  right: -32px;
  font-size: 25em;
  color: rgba(238, 238, 238, 0.8);
  font-weight: normal;
}

.quote-card.red-card {
  background: #F61E32;
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(34, 34, 34, 0.12), 0 2px 4px rgba(34, 34, 34, 0.24);
}

.quote-card.yellow-card {
  background: #F9A825;
  color: #222222;
  box-shadow: 0 1px 2px rgba(34, 34, 34, 0.12), 0 2px 4px rgba(34, 34, 34, 0.24);
}