.back_pdf .pdf_dropdown {
  position: relative;
}

.back_pdf .pdf_dropdown_menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  width: 140px;
  max-width: calc(100vw - 24px);
  margin: 6px 0 0;
  padding: 6px 0;
  list-style: none;
  background: #fff;
  border: 1px solid #002147;
  border-radius: 4px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.back_pdf .pdf_dropdown.open .pdf_dropdown_menu {
  display: block;
}

.back_pdf .pdf_dropdown_menu li {
  display: block;
  width: 100%;
  flex: none;
}

.back_pdf .pdf_dropdown_menu li a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  color: #002147;
  font-size: 13px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
}

.back_pdf .pdf_dropdown_menu li a img {
  width: 16px;
  height: auto;
}

.back_pdf .pdf_dropdown_menu li a:hover,
.back_pdf .pdf_dropdown_menu li a:active {
  background: #f0f4f8;
}

.back_pdf > ul {
  display: flex;
  flex-wrap: nowrap;
  justify-content: space-between;
  width: 100%;
}

.back_pdf > ul > li {
  flex: 1 1 0;
  min-width: 0;
  width: auto;
  padding: 0 4px;
  text-align: center;
}

.back_pdf > ul > li > a img,
.back_pdf > ul > li > img {
  max-width: 34px;
  width: 100%;
  height: auto;
  margin: 0 auto;
}

.back_pdf > ul > li > a,
.back_pdf > ul > li {
  font-size: 12px;
  line-height: 1.25;
  white-space: normal;
}