.balloon-bg {
    background-image: url("../images/backgrounds/balloon.jpg");
}
.energy-bg {
    background-image: url("../images/backgrounds/energy.jpg");
    filter: brightness(0.6);
}
.abstract-bg {
    background-image: url("../images/backgrounds/abstract.jpg");
}
.autumn-bg {
    background-image: url("../images/backgrounds/autumn.jpg");
}
.bokeh-bg {
    background-image: url("../images/backgrounds/bokeh.jpg");
}
.spring-bg {
    background-image: url("../images/backgrounds/spring.jpg");
}
.summer-bg {
    background-image: url("../images/backgrounds/summer.jpg");
}
.winter-bg {
    background-image: url("../images/backgrounds/winter.jpg");
}
.turbine-bg {
    background-image: url("../images/backgrounds/turbine.jpg");
}
.turbine-dark-bg {
    background-image: url("../images/backgrounds/turbine-dark.jpg");
}
.turbine-sky-bg {
    background-image: url("../images/backgrounds/turbine-sky.jpg");
}
.solar-bg {
    background-image: url("../images/backgrounds/solar.jpg");
}
.planks-bg {
    background-image: url("../images/backgrounds/planks.jpg");
}

.page-background {
    background-size: cover;
    height: 100%;
    bottom: 0;
    left: 0;
    mix-blend-mode: darken;
    position: fixed;
    right: 0;
    top: 0;
    background-position: center center;
}

.client-logo {
    margin-top: -100px;
}