*{
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: "Comic Sans MS", cursive, sans-serif;
  background-color: #121212;
  color: #fff;
}
.converter-card {
  width: 100%;
  max-width: 650px;
  background-color: #003b3d;
  border-radius: 12px;
}
.custom-input {
  background-color: transparent !important;
  border: none;
  border-radius: 0;
  color: #fff !important;
  box-shadow: none !important;
  flex-grow: 1;
}
.custom-input::placeholder {
  color: #888;
}
.exchange-btn i{
  transition: transform 0.3s ease;
}
.exchange-btn:hover i {
  transform: rotate(180deg);
}
.custom-select {
  background-color: #1a1a1a;
  border: 1px solid #333;
  border-radius: 8px;
  height: 55px;
}
.select-box {
  background-color: transparent !important;
  color: #fff !important;
  border: none !important;
  box-shadow: none !important;
  cursor: pointer;
}
.select-box option {
  background-color: #1a1a1a;
  color: #fff;
}
.from-flag img, .to-flag img {
  width: 40px;
  height: 40px;
  border-radius: 3px;
}
.btn-convert {
  background-color: #2d3436; 
  color: #fff; 
  border-radius: 6px; 
}
.btn-convert:hover { 
  background-color: #4a5557; 
}