style.css

* { margin: 0; padding: 0; border: 0; vertical-align: baseline; }
html { box-sizing: border-box; }
*, *:before *:after { box-sizing: inherit; }
html, body { height: 100%; margin: 0; }

body {
    font-family: "Segoe UI", sans-serif;
    background: #282828; color: #FFF;
    border: 1px solid #282828;
    overflow-y: hidden;
}

#titlebar {
    display: block;
    position: fixed;
    height: 32px;
    width: calc(100% - 2px);
    background: #282828; color: #FFF;
}

#titlebar #drag-region {
    width: 100%;
    height: 100%;
    -webkit-app-region: drag;
    display: grid;
    grid-template-columns: auto 138px;
}

#window-title {
    grid-column: 1;
    display: flex;
    align-items: center;
    font-family: "Segoe UI", sans-serif;
    font-size: 12px;
    margin-left: 8px;
    overflow-x: hidden;
}

#window-title span {
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.5;
}

#window-controls {
    display: grid;
    grid-template-columns: repeat(4, 46px);
    position: absolute;
    top: 0;
    right: 0;
    height: 100%;
    font-family: "Segoe MDL2 Assets";
    font-size: 10px;
    -webkit-app-region: no-drag;
}

#window-controls .button {
    grid-row: 1 / span 1;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    user-select: none;
    cursor: default;
}

#window-controls .button:hover {
    background: rgba(255, 255, 255, 0.2);
    opacity: 1;
}

#window-controls #pin-button, #window-controls #unpin-button {
    grid-column: 1;
    font-size: 14px;
}

#window-controls #unpin-button {
    display: none;
}

#window-controls #min-button {
    grid-column: 2;
}

#window-controls #max-button, #window-controls #restore-button {
    grid-column: 3;
}

#window-controls #restore-button {
    display: none;
  }

#window-controls #close-button {
    grid-column: 4;
}

#window-controls #close-button:hover {
    background: #ff0000;
}

#main {
    height: calc(100% - 32px);
    margin-top: 32px;
    padding: 20px;
    overflow-y: auto;
}

.main-controls {
    position: absolute;
    top: 0;
    right: 0;
    margin: 0;
    margin-top: 32px;
    padding: 0;
    z-index: 2;
}

#video-input {
    background-color: rgba(255, 255, 255, .1); color: #FFF;
    outline: none;
    border: none;
    margin: 0;
    padding: 0%;
    width: 70%;
}

#video-input:hover {
    background-color: rgba(255, 255, 255, .2);
}

#go-button {
    border: 0px;
    margin: 0;
    padding: 0;
    width: 25%;
    opacity: .75;
}

#go-button:hover {
    opacity: 1;
}

.container {
    height: 100vh;
    width: 100vw;
}

#yt-video {
    position: absolute;
    top: 0;
    left: 0;
    margin: 0;
    margin-top: 32px;
    border: none;
    outline: none;
    height: calc(100% - 32px);
    width: 100%;
    z-index: 1;
}

@media screen and (max-width: 400px) {
    .main-controls {
        display: none;
    }
}