here edit this file:
:root {
  --bg-color: #ffffff;
  --text-color: #000000;
  --card-bg: #f5f5f5;
  --border-color: #ccc;
}

body.dark {
  --bg-color: #1e1e1e;
  --text-color: #f0f0f0;
  --card-bg: #2a2a2a;
  --border-color: #444;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
}

.container {
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

.services {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.service-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  width: 130px;
}

.service-card img {
  width: 40px;
  height: 40px;
  margin-bottom: 0.5rem;
}

.service-card a {
  color: var(--text-color);
  text-decoration: none;
  display: block;
  font-weight: bold;
}

.bookmark-groups {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin: 2rem 0;
}

.bookmark-group {
  flex: 1 1 250px;
}

.bookmark-group h3 {
  margin-bottom: 0.5rem;
}

.bookmark-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.6rem;
  margin: 0.25rem;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  text-decoration: none;
  color: var(--text-color);
  font-size: 0.9rem;
}

.bookmark-btn img {
  height: 16px;
  width: 16px;
  margin-right: 5px;
}

.theme-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.switch {
  position: relative;
  display: inline-block;
  width: 40px;   /* smaller width */
  height: 22px;  /* smaller height */
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 22px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;  /* smaller knob */
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: #2196f3;
}

input:checked + .slider:before {
  transform: translateX(18px); /* adjust based on new width */
}

.label-text {
  font-size: 1rem;
  color: var(--text-color);
  white-space: nowrap;
}