body {
    margin: 0;
    padding: 0;
}

h1 {
  font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
  color: rgb(230, 31, 31);
}

h2 {
  font-size: 1.8rem;
  font-weight: bold;
}

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

.navbar {
  margin-bottom: 0px;
}

.section {
    margin-left: 10px;
    margin-bottom: 40px;
}

.tutorial {
position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 aspect ratio */
  overflow: hidden;
  margin-bottom: 20px;
}

.responsive-iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.portfolio {
  margin-top: 20px;
  margin-bottom: 0px;
  display: block;
  position: relative;
  z-index: 0;
  overflow: hidden; }
.portfolio img {
  -webkit-transform: scale(1);
  -moz-transform: scale(1);
  -o-transform: scale(1);
  -ms-transform: scale(1);
  transform: scale(1);
  -webkit-transition: 0.3s;
  -o-transition: 0.3s;
  transition: 0.3s; }
@media screen and (prefers-reduced-motion: reduce) {
  .portfolio img {
    -webkit-transition: none;
    -o-transition: none;
    transition: none; } }
.portfolio:after {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  content: '';
  background: #1b212c;
  opacity: .2;
  -webkit-transition: 0.3s;
  -o-transition: 0.3s;
  transition: 0.3s;
  z-index: 0; }
@media screen and (prefers-reduced-motion: reduce) {
  .portfolio:after {
    -webkit-transition: none;
    -o-transition: none;
    transition: none; } }
.portfolio .icon, .portfolio .heading {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  content: '';
  z-index: 1;
  opacity: 0;
  -webkit-transition: 0.3s;
  -o-transition: 0.3s;
  transition: 0.3s; }
@media screen and (prefers-reduced-motion: reduce) {
  .portfolio .icon, .portfolio .heading {
    -webkit-transition: none;
    -o-transition: none;
    transition: none; } }
.portfolio .icon span, .portfolio .heading span {
  color: #fff;
  font-size: 24px; }
.portfolio .heading {
  padding: 20px; }
@media (max-width: 767.98px) {
  .portfolio .heading {
    opacity: 1; } }
.portfolio .heading h3 {
  font-size: 18px;
  color: #fff;
  font-weight: 300;
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 0; }
.portfolio .heading h3 span {
  font-size: 13px;
  letter-spacing: 0;
  text-transform: capitalize;
  color: rgba(255, 255, 255, 0.7); }
.portfolio:hover:after {
  opacity: .5; }
.portfolio:hover .icon, .portfolio:hover .heading {
  opacity: 1; }
.portfolio:hover img {
  -webkit-transform: scale(1.1);
  -moz-transform: scale(1.1);
  -o-transform: scale(1.1);
  -ms-transform: scale(1.1);
  transform: scale(1.1); }