* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}
body {
  font-size: 1rem;
  border-radius: 2rem;
  margin: 0 0 2rem;
}
.content {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1rem;
}
a {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}
button{
  color: #000;
  cursor: pointer;
}
h3 {
  font-size: 18px;
  font-weight: 500;
  padding: 0.25rem 0;
}
ul {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
}
li {
  margin-bottom: 0.25rem;
}
.gray {
  color: #4b4b4b;
}
.title {
  padding: 0.15rem 0;
  border-bottom: 1px solid #9f224e;
  display: inline-block;
  margin-bottom: 0.25rem;
  font-size: 14px;
}
.title-a {
  border-bottom-color: green;
}
header {
  padding: 0.5rem 0;
  position: sticky;
  top: 0;
  z-index: 999;
  background-color: #154d88;
}
header h3 {
  margin: 0;
  color: #fff;
}
.highlight-clip-text {
    scroll-margin-top: 150px; /* chiều cao header */
}
.flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
input {
  outline: none;
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 0;
  padding: 0.5rem 1rem;
  width: 100%;
  min-width: 300px;
  font: inherit;
  border-radius: 50px;
}
.ques {
  margin-bottom: 0.5rem;
  padding: 0.5rem;
  border: 1px solid #e5e5e5;
}
.ques:hover {
  background-color: #fafafa;
}
.ques h4 {
  margin: 0 0 0.275rem;
  font-weight: 500;
}
#search-controls {
  position: fixed;
  right: 1rem;
  transform: translateY(-50%);
  top: 50%;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
#search-controls button {
  outline: none;
  border: 1px solid #000;
  background-color: #fff;
  padding: 0.5rem;
  border-radius: 50%;
  margin: 0 0.25rem;
  width: 40px;
  height: 40px;
}
#search-controls img{
  width: 100%;
}
.d-none {
  display: none !important;
}
.input-group {
  position: relative;
}
.input-group #search{
  padding-right: 50px;
}
.input-group button {
  position: absolute;
  outline: none;
  border: 0;
  background-color: white;
  top: 1px;
  bottom: 1px;
  right: 10px;
  border-radius: 10px;
}
@media screen and (max-width: 768px) {
  .flex {
    flex-direction: column;
    gap: 0.5rem;
  }
}