:root {
    --smokeWidth: 10vw;
    --Pic_Width_Height_Ratio: 2152 / 2888;
    --Pic_End_Height: min(90vh, calc(100vw * (1 / (2152 / 2888)) * 0.90));
}

* {
    margin: 0;
}

body {
    background-color: black;
}

/* Hide scrollbar for Chrome, Safari and Opera */
.example::-webkit-scrollbar {
    display: none;
}

/* Hide scrollbar for IE, Edge and Firefox */
.example {
  -ms-overflow-style: none;  /* IE and Edge */
  scrollbar-width: none;  /* Firefox */
}

/* SMOKE STUFF */

.class_smoke {
    position: top center;
/*    background-attachment:scroll;*/
    background-size: 110vw auto;
    width: var(--smokeWidth);
    /*height: auto;*/
    margin: 0;
    float: left;
}

#id_smoke_div {
    position: fixed;
/*    background-attachment:scroll;*/
    height: 1200vh;
    width: var(--smokeWidth);
    z-index: -1;
}

/* SCROLLING STUFF */

.class_scroll_element {
    --width: calc(var(--Pic_Width_Height_Ratio) * var(--Pic_End_Height));
    position: fixed;
    margin-top: 200vh;
    margin-left: calc((100vw - var(--width)) / 2);
    width: var(--width);
    height: 1vh;
}

.class_scroll_pic {
    height: var(--Pic_End_Height);
    width: auto;
    object-position: center;
    margin-top: -40vh;
}

#id_placeholder {
    width: 10vw;
    margin-top: 700vh;
    position: absolute;
}

/* OTHER STUFF*/

#id_test {
    color: red;
    width: 5vw;
    margin-left: 80vw;
    font-size: 3vw;
    float: left;
}

#id_Briefkasten {
    z-index: 2;
}

#id_Gehaeuse {
    z-index: 1;
}