openmct/platform/commonUI/general/res/sass/_logo-and-bg.scss

.l-splash {
    background-size: cover;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    &:before,
    &:after {
        background-position: center;
        background-repeat: no-repeat;
        background-size: contain;
        content: '';
        position: absolute;
    }

    &:before {
        // NASA logo
        $w: 5%;
        $m: 10px;
        background-image: url($dirImgs + 'logo-nasa.svg');
        top: $m;
        right: auto;
        bottom: auto;
        left: $m;
        height: auto;
        width: $w * 2;
        padding-bottom: $w;
        padding-top: $w;
    }

    &:after {
        // App logo
        top: 0;
        right: 15%;
        bottom: 0;
        left: 15%;
    }
}

.s-splash {
    background-image: url($dirImgs + "bg-about-openmctweb.jpg"); // For OpenMCT Web.
    &:after {
        background-image: url($dirImgs + 'logo-openmctweb-shdw.svg');
    }
}