body {
  margin: 0;
}

header.masthead {
  position: relative;
  margin-bottom: 3rem;
  padding-top: calc(8rem + 57px);
  padding-bottom: 8rem;
  background: no-repeat center center;
  background-color: #6c757d;
  background-size: cover;
  background-attachment: scroll;
}

header.masthead:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  /* background-color: #212529; */
  opacity: 0.5;
}

header.masthead .site-heading1 {
  text-align: center;
  width: auto;
  color: white;
  background-color: #212529;
  /* color: #212529;
  background-color: white; */
}

header.masthead .site-heading2 {
  text-align: center;
  width: auto;
  color: #212529;
  background-color: white;
}

@media (min-width: 992px) {
  header.masthead {
    padding-top: 12.5rem;
    padding-bottom: 12.5rem;
  }
}

h3,
.h3 {
  font: white;
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-family: "Open Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  font-weight: 800;
  line-height: 1.2;
}


h3,
.h3 {
  font-size: calc(1.3rem + 0.6vw);
}

@media (min-width: 1200px) {

  h3,
  .h3 {
    font-size: 1.75rem;
  }
}

#container {
  padding-right: 1.5rem !important;
  padding-left: 1.5rem !important;
}

#container {
  padding-right: 3rem !important;
  padding-left: 3rem !important;
}

p {
  text-align: center;
}

#star {
  width: 20px;
  height: 20px;
}

i {
  text-align: center;
  font-size: 20px;
}

script{
  vertical-align: middle;
}

li{
  list-style: none;
  text-align : center;
}

#driver{
  margin: auto;
  display: block;
}

#stage{
  text-align: center;
}

img{
  width: 500px;
}

.flip-box {
  width: 200px;
  height: 100px;
  perspective: 1000px;
}
.flip-box:hover .flip {
  transform: rotateY(-180deg);
}
.flip {
  width: 200px;
  height: 100px;
  position: relative;
  color: white;
  text-align: center;
  line-height: 100px;
  transform-style: preserve-3d;
  transform: rotateY(0deg);
  transition: .5s;
}
.front, .back {
  width: 100%;
  height: 100%;
  position: absolute;
  backface-visibility: hidden;
}
.front {
  background: skyblue;
}
.back {
  background:darkseagreen;
  transform: rotateY(180deg);
}