* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden; 
}

.embed-container {
    position: relative;
    width: 100vw; 
    height: 100vh; 
    overflow: hidden; 
}

.embed-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    overflow: hidden; 
}

.btm {
    position: fixed; 
    padding: 70px 100px;
    background: transparent; 
    color: #000; 
    text-decoration: none;
    border: none; 
    cursor: pointer;
    font-size: 16px;
    outline: none; 
    -webkit-tap-highlight-color: transparent; 
    z-index: 10; 
}

.btm:active, .btm:focus {
    background: transparent;
    color: #000;
    outline: none;
}

.btm:hover {
    color: #555; 
}
@media (min-width: 481px) and (max-width: 1024px) {
  .btm {
      display: none; 
  }
}
@media screen and (max-width: 480px) {
  .btm {
      width: 80%;  
      height: 50vh;  
      top: 30vh;    
      left: 10vw;    
      opacity: 0;   
  }
}
@media screen and (max-width: 375px) {
  .btm {
      width: 80%;  
      height: 50vh;  
      top: 40vh;    
      left: 10vw;   
      opacity: 0;   
  }
}