KohyaSS/style.css

#open_folder_small{
    height: auto;
    min-width: auto;
    flex-grow: 0;
    padding-left: 0.25em;
    padding-right: 0.25em;
}

#open_folder{
    height: auto;
    flex-grow: 0;
    padding-left: 0.25em;
    padding-right: 0.25em;
}

#number_input{
    min-width: min-content;
    flex-grow: 0.3;
    padding-left: 0.75em;
    padding-right: 0.75em;
}