body, html {
  margin: 0;
  height: 100%;
  width: 100%;
  background-color: black;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

header {
  padding: 2rem 0;
}
header img {
  width: 200px;
}
.call-wrapper{
  margin:0 auto;
}

.register input{
  width:300px;
  margin: 10px;
}
 .table td{
   vertical-align: middle;
 }
.icons{
  display: flex;

}
.boxClass span{
  margin: 10px;
  display: inline-block;
  width: 200px;
}

#checkboximg{
  width: 8%;
}

.click-wrapper {
  width: 100%;
  text-align: center;
}

.click-wrapper iframe {
  width: 100%;
  height: 150px;
  margin: 0 auto;
}

footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  font-size: 0.8rem;
  color: #AAA;
  padding: 1rem 0;
}

.user-guide {
  padding: 1rem;
}
.container{

}
.user-guide img {
  width: 25px;
  margin-right: 0.5rem;
}

.user-guide a {
  font-size: 0.6rem;
  color: #FFF;
  text-decoration: none;
  font-weight: 100;
  display: inline;
  line-height: 25px;
  margin: 0.5rem;
  cursor: pointer;

}

.user-guide a:hover {
  color: #FFF;
  text-decoration: none;
}

/* Small devices (landscape phones, 576px and up) */
@media (max-width: 576px) {
 header img {
   width: 200px;
 }
 .call-wrapper {

  height: 197px;
  width: 350px;
 }
 .click-wrapper iframe {
   width: 350px;
   height: 150px;
   margin: 0 auto;
 }
 footer {
   position: inherit;
 }
 #connectSection {
   display: flex;
   flex-direction: column;
   justify-content: center;
   height: calc( 100vh - 300px );
   min-height: 420px;
 }
}
 /* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
  header img {
    width:  200px;
  }
  .call-wrapper {

    height: 287px;
  }
  .click-wrapper iframe {
    width: 100%;
    height: 150px;
    margin: 0 auto;
  }
  footer {
    position: inherit;
  }
  #connectSection {
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: calc( 100vh - 155px );
    min-height: 700px;
  }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
  .call-wrapper {
    height: 388px;
  }
  #connectSection {
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: calc( 100vh - 155px );
  min-height: 700px;
  }

}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
  .call-wrapper {
    height: 524px;
  }
  #connectSection {
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: calc( 100vh - 200px );
    min-height: 750px;
  }
  .user-guide {
    padding: 1rem;
  }
  .user-guide img {
    width: 30px;
  }
  .user-guide a {
    font-size: 1.2rem;
    line-height: 20px;
  }

}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
  .call-wrapper {
    height: 524px;
    width: 931px;
    margin: 0 auto;
  }
  #connectSection {
    min-height: 720px;
    height: calc( 100vh - 170px );
  }
  .click-wrapper iframe {
    width: 931px;
    height: 150px;
    margin: 0 auto;
  }
}

@media (min-width: 1400px) {
  .call-wrapper {
    height: 524px;
    width: 931px;
    margin: 0 auto;

  }
  .click-wrapper iframe {
    width: 931px;
    height: 150px;
    margin: 0 auto;
  }
  #connectSection {
    min-height: 720px;
    height: calc( 100vh - 170px );
  }
}