zitadel/internal/login/static/resources/themes/scss/light.scss

// ---- LIGHT-THEME-------
html {
    background-color: $backgroundColorLight;
    color: $fontColorLight;
    
    header .logo {
        background-image: url($logoImgLight);
    }

    h1 {
        color: $fontColorLight;
    }

    button {
        background-color: $backgroundColorLight;
        color: $primaryColorLight;
        border: 2px solid $primaryColorLight;

        &:hover {
            background-color: $primaryColorHoverLight;
            border: 2px solid $primaryColorHoverLight;
        }

        &.primary {
            background-color: $primaryColor;
            color: $fontColor;
            border: none;
            box-shadow: 0px 10px 30px $primaryColor;
            &:hover {
                background-color: $primaryColorHover;
            }
        }
    }

    input {
        background-color: $backgroundColorLight;
        color: $fontColorLight;
    }

    #qrcode {
        svg rect[style*="fill:white"] {
            fill: $backgroundColorLight !important;
        }

        svg rect[style*="fill:black"] {
            fill: $fontColorLight !important;
        }
    }

    footer {
        background-image: url($footerimgLight);
    }
}