.bottom_frame {
    --offset_left: 0;
    --offset_right: 0;
    position: relative;
    display: flex;
    flex-direction: row;
    flex-flow: row wrap;
    box-sizing: border-box;
    justify-content: flex-start;
    align-items: center;
    align-content: flex-end;
    background-color: var(--background_color);
    z-index: 3;
    transition: opacity 2s ease-out, transform 2s ease-out;
    opacity: 0;
    transform: scaleY(0);
    transform-origin: bottom;
    pointer-events: auto;
    padding: 0 24px;
    order: 2;
    flex: 0 0 var(--bottom_frame_height);
}

@media only screen and (max-width: 820px) {
    .bottom_frame {
        padding: 0 10px;
    }
}

.bottom_frame.show {
    opacity: 1.0;
    transform: scaleY(1);
}

.bottom_frame div {
    font-size: calc(22px * var(--window_scale));
}

.right_bottom_frame{
    display: flex;
    flex-flow: row nowrap;
    justify-content: flex-end;
    align-items: center;
    align-content: flex-end;
    margin-left: auto;
    order: 1;
}



.bottom_frame button {
    background-position: center center;
    background-size: cover;
    background-repeat: no-repeat;
    background-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 0;
}

.toggle_size_button {
    transition: opacity 2s ease-out;
    opacity: 0;
    pointer-events: none;
    z-index: 5;
    order: 1;
}

.toggle_size_button.show {
    opacity: 1;
    pointer-events: auto;
}

.quality_button {
    transition: opacity 2s ease-out;
    opacity: 0;
    pointer-events: none;
    z-index: 5;
}

.quality_button.show {
    opacity: 1;
    pointer-events: auto;
}

.toggle_start_button {
    position: relative;
    transition: opacity 2s ease-out;
    opacity: 0;
    pointer-events: none;
    z-index: 5;
}

.toggle_start_button.show {
    opacity: 1;
    pointer-events: auto;
}

.bottom_frame .material-icons {
    background-color: transparent;
    transform-origin: center;
    transform: scaleX(1) scaleY(1);
    font-size: calc(26px * var(--window_scale));
    transition: transform 0.3s ease-in-out;
}

.bottom_frame .material-icons:hover {
    transform: scaleX(1.2) scaleY(1.2);

}

.bottom_frame .material-icons:active {
    transform: scaleX(1.1) scaleY(1.1);
}

.normal_icon.normal_icon {
    font-size: 32px;
}