* {
  margin: 0;
  padding: 0;
  font-family: sans-serif, serif;
  box-sizing: border-box;
}

.container {
  width: 100%;
  min-height: 100vh;
  background: #242424;
  display: flex;
  align-items: center;
  justify-content: center;
}

#left,
#right {
  width: 300px;
  min-height: 400px;
  margin: 20px;
  border: 2px dashed #ffffff;
}

.list {
  background: #000000;
  height: 60px;
  margin: 30px;
  color: #ffffff;
  display: flex;
  align-items: center;
  cursor: grab;
}

.list img {
  width: 10px;
  margin-right: 15px;
  margin-left: 20px;
}

.list:hover {
  background-color: #333333;
}

/* Mobile version (max-width: 520px) */
@media only screen and (max-width: 520px) {
  .container {
    flex-direction: column;
  }

  #left,
  #right {
    width: 100%;
    min-height: 200px;
    margin: 10px;
  }

  .list {
    height: 40px;
    margin: 20px;
  }

  .list img {
    width: 8px;
    margin-right: 10px;
    margin-left: 15px;
  }
}