footer {
  position: relative;
  bottom: 0;
  width: 100%;
  background-color: gainsboro;
  color: #000000;
  text-align: center;
  padding: 1em;
}

#about-content {
  margin-top: 10em;
  margin-left: 5%;
  margin-right: 5%;
  margin-bottom: 5em;
  font-size: 17px;
}
/* Advertisement */
.ad-slider1 {
  flex: 0 0 auto;
  width: 100vw;
  height: auto;
  background-color: red;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 1em;
}

.ad-slider2 {
  flex: 0 0 auto;
  width: 100vw;
  height: auto;
  background-color: blue;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 1em;
}

.ad-slider3 {
  flex: 0 0 auto;
  width: 100vw;
  height: auto;
  background-color: green;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 1em;
}

.ad-slider4 {
  flex: 0 0 auto;
  width: 100vw;
  height: auto;
  background-color: rgb(166, 0, 255);
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 1em;
}
/* END */

@media only screen and (max-width: 500px) {
  .carousel-caption {
    display: block !important;
  }
  .display-4 {
    font-size: 25px !important;
  }
  .carousel-item {
    height: 70vh;
  }
  .ml-2,
  .mx-2 {
    margin-left: 0rem !important;
  }
  .mx-auto {
    margin-bottom: 1em;
  }
  .ml-2 {
    margin-bottom: 1em;
  }
}