body {
    margin: 0px;
    padding: 0px;
    background-color: rgb(238, 238, 238);
}
.header {
    font-family: 'Roboto', sans-serif;
    font-size: 30px;
    color: white;
    background-color: rgb(0, 0, 0, 0.9);
    height: 80px;
    text-align: center;
    padding-top: 1px;
    
}
iframe {
    width: 500px;
    height: 280px;
}
.video {
    max-width: 1100px;
    display: flex;
    margin-bottom: 30px;
    margin-left: auto;
    margin-right: auto;
    justify-content: space-between;
}
.end {
    font-family: 'Montserrat', sans-serif;
    font-size: 30px;
    height: 50px;
    text-align: center;
    padding-top: 10px;  
    margin-bottom: 30px; 
}
.end a {
    padding: 10px 15px 10px 15px;
    border: 2px solid black;
    border-radius: 10px;
    box-shadow: 3px 3px rgb(65, 64, 64), -0.3em 0 .4em rgb(148, 148, 148);
}
a {
    color: black;
    text-decoration: none;
    cursor: pointer;
}
a:hover {
    color: gray;
}
@media (max-width:1920px) {
      .header {
        max-width: 1920px;
      }
    }
@media (max-width:1500px) {
    .header {
        max-width: 1500px;
      }
      .video {
        display: flex;
    }
    iframe {
        margin: 0px;
        max-width: 600px;
        max-height: 250px;
        margin-bottom: 40px;
        margin-right: 50px;
    }
}

@media (max-width:1148px) {
    
      .header {
        max-width: 1148px;
      }
      .video {
        display: block;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }
    iframe {
        margin: 0px;
        max-width: 1148px;
        max-height: 574px;
        margin-bottom: 40px;
        margin-right: 0px;
    }
}
@media (max-width:992px) {

    .header {
        max-width: 992px;
      }
      .video {
        display: block;
    }
    iframe {
        margin: 0px;
        max-width: 992px;
        max-height: 496px;
        margin-bottom: 40px;
    }
}
@media (max-width:1024px) {
    .header {
        max-width: 1024px;
      }
      .video {
        display: block;
    }
    iframe {
        margin: 0px;
        max-width: 1024px;
        max-height: 512px;
        margin-bottom: 40px;
    }
}
@media (max-width:768px) {
    .header {
        max-width: 768px;
      }
      .video {
        display: block;
    }
    iframe {
        margin: 0px;
        max-width: 768px;
        max-height: 384px;
        margin-bottom: 40px;
    }
}
@media (max-width:480px) {

    .header {
        max-width: 480px;
      }
    .video {
        display: block;
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }
    iframe {
        margin: 0px;
        max-width: 400px;
        max-height: 240px;
        margin-bottom: 40px;
    }
}
@media (max-width:410px) {

      .header {
        max-width: 410px;
      }

    .video {
        display: block;
        max-width: 290px;
        margin-left: auto;
        margin-right: auto;
    }
    iframe {
        margin: 0px;
        max-width: 290px;
        max-height: 150px;
        margin-bottom: 40px;
    }
}
@media (max-width:320px) {

      .header {
        max-width: 320px;
      }

    .video {
        display: block;
    }
    iframe {
        margin: 0px;
        max-width: 280px;
        max-height: 160px;
        margin-bottom: 40px;
    }
}