h1 {
    margin: 10px 0;
    font-size: 40px;
}
#scanner{
    position: absolute;
    z-index: 900;
    top: 0;
    left: 0;
    background-color: black;
    overflow:hidden;
    width: 100vw;
    height: 100vh;
    padding:2px;
}

#video-error {
    text-align: center;
    background-color: #eee;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    vertical-align: middle;
}

#video-error table{
    width: 100%;
    height: 100%;
    text-align: center;
    color:red;
    font-size:20px;
}

#video {
    /*width: 100vw;*/
    height: 100%;
    margin: 0 auto;
    /*margin-top:25px;*/
    position: relative;
    display: block;
    /*border:1px solid red;*/
}

.corner {
    display: none;
    position: absolute;
    width: 50%;
    height: 50%;
    margin: 20px;
    background: none;
    color: transparent;
    padding: 0;
    box-sizing: content-box;
    border: 2px solid transparent;
    top: 150px;
    left: 82px;
}

.corner::before, .corner::after, .corner span::before, .corner span::after {
    display: block;
    content: "";
    width: 20px;
    height: 20px;
    position: absolute;
}

.corner::before {
    top: -2px;
    left: -2px;
    border-top: 2px solid yellow;
    border-left: 2px solid yellow;
}

.corner::after {
    top: -2px;
    right: -2px;
    border-top: 2px solid yellow;
    border-right: 2px solid yellow;
}

.corner span::before {
    bottom: -2px;
    left: -2px;
    border-bottom: 2px solid yellow;
    border-left: 2px solid yellow;
}

.corner span::after {
    bottom: -2px;
    right: -2px;
    border-bottom: 2px solid yellow;
    border-right: 2px solid yellow;
}

/*GREEN*/
.corner-green::before {
    border-top: 2px solid green;
    border-left: 2px solid green;
}

.corner-green::after {
    border-top: 2px solid green;
    border-right: 2px solid green;
}

.corner-green span::before {
    border-bottom: 2px solid green;
    border-left: 2px solid green;
}

.corner-green span::after {
    border-bottom: 2px solid green;
    border-right: 2px solid green;
}

#flash-button{
    position:absolute;
    top:85px;
    right:20px;
    color:white;
    font-size:30px;
    z-index:100;
    padding: 3px 8px;
    border: 1px solid white;
    border-radius: 300px;
    width:40px;
    height:40px;
}
#flash-button.active{
    color:yellow;
    border: 1px solid yellow;
    width:40px;
    height:40px;
}
#flash-button i{
    position: absolute;
    /*margin-left: 2px;*/
    margin-left: -8px;
    margin-top: 2px;
}

#close-button{
    position:absolute;
    top:20px;
    right:20px;
    color:white;
    font-size:30px;
    z-index:100;
    padding: 3px 8px;
    border: 1px solid white;
    border-radius: 300px;
    width:40px;
    height:40px;
}
#close-button i{
    position: absolute;
    /*margin-left: 2px;*/
    margin-left: -9.5px;
    margin-top: 2px;
}

@media only screen and (orientation: landscape) {
    .corner {
        top: 70px;
        left: 170px;
    }
}