body, html {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}
#model-bg {
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  overflow: auto;
  background-color: rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
}
#model {
  background-color: rgba(0, 26, 51, 0.8);
  color: #ffffff;
  padding: 2rem;
  width: 30%;
  box-shadow: 0 5px 8px 0 rgba(0, 0, 0, 0.2), 0 7px 20px 0 rgba(0, 0, 0, 0.17);
  position: relative;
  border-radius: 5px;
}
.flex-center {
  display: flex;
  justify-content: center;
}
#closeBtn {
  color: #cccccc;
  background-color: rgb(0, 26, 51);
  padding: 10px 20px;
  border: 1px solid #ffffff;
  text-transform: uppercase;
  font-weight: bold;
}
#closeBtn:hover,
#closeBtn:focus {
  color: rgb(0, 26, 51);
  background-color: #ffffff;
  cursor: pointer;
}
.header {
  display: flex;
  font-size: 2rem;
  justify-content: center;
  align-items: center;
  border-bottom: 1px solid #ffffff;
  padding-bottom: 1rem;
}
.title {
  padding-left: 1rem;
}
.center {
  text-align: center;
  font-size: 14px;
}
.link {
  color: lightblue;
  font-style: italic;
  padding-left: 5px;
  font-weight: bold;
}
.link:hover {
  color: aqua;
}

@media only screen and (min-width: 1000px) {
  .mobile {
    display: none;
  }
}
@media only screen and (max-width: 1000px) {
  .desktop {
    display: none;
  }
  #model {
    width: 70%;
  }
}