.content-container 
{
    font-family: Arial, Helvetica, sans-serif;
    padding: 5px 25px;
    background-color: #e9e9e9;
    border-radius: 35px;
    border-style: groove;
    border-color: lightgray;
}

.horizontal-list
{
    display: flex;
    flex-wrap: wrap;
    gap: 1px;
}

.horizontal-list > * 
{
  flex: 0 1 auto;
}

.flashcards-app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-family: sans-serif;
}

.flashcards-app .card {
  width: 300px;
  height: 180px;
  perspective: 800px;
  margin-bottom: 15px;
}

.flashcards-app .inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.4s;
}

.flashcards-app .inner.flipped {
  transform: rotateY(180deg);
}

.flashcards-app .front,
.flashcards-app .back {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 1px solid black;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px;
  backface-visibility: hidden;
  background: white;
}

.flashcards-app .back {
  transform: rotateY(180deg);
  flex-direction: column;
}

.flashcards-app .guess-input {
  width: 400px;
  margin-top: 10px;
  position: static;
  z-index: auto;
  display: block;
  padding: 5px;
  border-style: none;
  font-size: 20px;
  font-style: italic;
}
.button {
    border-radius: 0px;
    border-style: solid;
    border-width: 1px;
    border-color: black;
    background-color: white;
    padding: 7px 25px;
    font-size: 20px;  
}
.button:hover {
    text-decoration: underline;
    cursor: pointer;
    background-color: #f0f0f0;
}