.main-container {
  width: 100%;
  max-width: 1300px;
  margin: 20px auto;
  font-size: 20px;
  overflow: hidden;
}

.card {
  border: 1px solid black;
  box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.2);
  padding: 15px;
  margin-bottom: 20px;
  box-sizing: border-box;
}

.float-left {
  float: left;
  width: calc(50% - 10px);
}

.float-right {
  float: right;
  width: calc(50% - 10px);
}

@media (max-width: 768px) {
  .main-container {
    font-size: 16px;
  }

  .float-left,
  .float-right {
    float: none;
    width: 100%;
  }
}