EmulatorJS/src/css/main.css

.ejs_parent {
    background: #000;
    overflow: hidden;
    --ejs-primary-color: 26,175,255;
    position: relative;
    font-family: Avenir, "Avenir Next", "Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    font-weight: 500;
    line-height: 1.7;
    width: 100%;
    height: 100%;
}

.ejs_game {/* todo. User selectable background loading image */
    width: 100%;
    height: 100%;
    background-color: rgb(51, 51, 51);
    cursor: default;
}

.ejs_start_button {
    position: absolute;
    bottom: 65px;
    left: 50%;
    transform: translateX(-50%);
    cursor: pointer;
    box-sizing: inherit;
    
    display: flex;
    justify-content: center;
    text-shadow: 0 1px 1px rgba(0,0,0,0.5);
    font-size: 20px;
    line-height: 45px;
    text-transform: uppercase;
    font-weight: bolder;
    position: relative;
    text-decoration: none;
    width: 200px;
    height: 45px;
    border: 0;
    color: #fff !important;
    border-radius: 35px;
    text-align: center;
    background-color: rgba(var(--ejs-primary-color),1);
}

.ejs_start_button:active {
    box-shadow: 0 0 0 0 #222, 0 3px 7px 0 #111, inset 0 1px 1px 0 rgba(250,250,250,0.2), inset 0 -10px 35px 5px rgba(0,0,0,0.5);
    bottom: 64px;
}

.ejs_loading_text {
    position: absolute;
    bottom: 20px;
    font-weight: 500;
    left: 50%;
    transform: translateX(-50%);
    box-sizing: inherit;
    font-size: 12px;
    color: #bcbcbc;
}

.ejs_canvas {
    width: 100%;
    height: 100%;
}

.ejs_context_menu {
    position: absolute;
    display: none;
    z-index: 9;
    background: rgba(16,16,16,0.9);
    border-radius: 3px;
    font-size: 13px;
    min-width: 140px;
    padding: 8px;
    box-sizing: inherit;
}

.ejs_context_menu li {
    padding: 4px 11px;
    text-align: center;
}

.ejs_context_menu li a {
    color: #999;
    display: block;
    font-size: 13px;
}
.ejs_context_menu ul {
    color: #999;
    display: block;
    font-size: 13px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.ejs_context_menu li:hover {
    background: rgba(var(--ejs-primary-color),1);
    border-radius: 4px;
    box-shadow: 0 0 0 5px rgba(var(--ejs-primary-color),0.5);
    outline: 0;
}

.ejs_menu_bar {
    padding: 15px 10px 10px;
    background: linear-gradient(rgba(0,0,0,0),rgba(0,0,0,0.7));
    border-bottom-left-radius: inherit;
    border-bottom-right-radius: inherit;
    bottom: 0;
    color: #fff;
    left: 0;
    position: absolute;
    right: 0;
    transition: opacity .4s ease-in-out,transform .4s ease-in-out;
    z-index: 3;
    align-items: center;
    display: flex;
    justify-content: flex-start;
    text-align: center;
}

.ejs_menu_bar svg {
    display: block;
    fill: currentColor;
    height: 18px;
    pointer-events: none;
    width: 18px;
}

.ejs_menu_bar_hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(100%);
}

.ejs_menu_button {
    margin-right: 2px;
    touch-action: manipulation;
    background: transparent;
    border: 0;
    border-radius: 3px;
    color: inherit;
    cursor: pointer;
    flex-shrink: 0;
    overflow: visible;
    padding: 7px;
    position: relative;
    transition: all .3s ease;
}

.ejs_menu_button:hover {
    background: rgba(var(--ejs-primary-color),1);
    color: #fff;
}

.ejs_menu_button:hover .ejs_menu_text {
    transform: translate(0,0) scale(1);
    opacity: 1;
}

.ejs_menu_text {
    left: 0;
    background: rgba(255,255,255,0.9);
    border-radius: 3px;
    bottom: 100%;
    box-shadow: 0 1px 2px rgba(0,0,0,0.15);
    color: #4f5b5f;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.3;
    margin-bottom: 10px;
    opacity: 0;
    padding: 5px 7.5px;
    pointer-events: none;
    position: absolute;
    transform: translate(0,10px) scale(0.8);
    transform-origin: 0 100%;
    transition: transform .2s .1s ease,opacity .2s .1s ease;
    white-space: nowrap;
    z-index: 2;
}

.ejs_menu_text::before {
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid rgba(255,255,255,0.9);
    bottom: -4px;
    content: '';
    height: 0;
    left: 16px;
    position: absolute;
    transform: translateX(-50%);
    width: 0;
    z-index: 2;
}

.ejs_popup_container {
    background: rgba(0,0,0,0.8);
    text-align: center;
    z-index: 9999;
    height: 100%;
    overflow: hidden;
    position: absolute;
    top: 0;
    width: 100%;
    color: #ccc;
}

.ejs_popup_container h4 {
    color: #ccc;
    font-size: 24px;
    margin: 0;
    padding: 10px;
}

.ejs_button {
    border-radius: .25rem;
    font-size: .875rem;
    padding-left: 1rem;
    padding-right: 1rem;
    padding-top: .5rem;
    padding-bottom: .5rem;
    display: inline-block;
    background-color: rgba(var(--ejs-primary-color),1);
    margin: 0 10px;
    color: #fff !important;
    touch-action: manipulation;
    cursor: pointer;
}

.ejs_popup_body {
    height: calc(100% - 130px);
}