body, html {
    padding: 0;
    margin: 0;
    background-color: #e1f5cb;
    height: 100vh;
}

.master {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    height: 100%;
    overflow: hidden;
}
.video {
    width: 600px;
    border: 0;
    position: relative;
}

.hide {
    position: absolute;
    height: 100%;
    width: 2px;
    background-color: #e1f5cb;
    left: calc(50% - 300px);
    z-index: 99;
}
.hider {
    position: absolute;
    height: 100%;
    width: 2px;
    background-color: #e1f5cb;
    right: calc(50% - 300px);
    z-index: 99;
}