body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #f0f0f0;
  overflow: hidden;
}

.cross {
  width: 30px;
  height: 30px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.cross::before, .cross::after {
  content: "";
  position: absolute;
  background-color: #ffffff;
}

.cross::before {
  width: 100%;
  height: 2px;
  top: 50%;
  left: 0;
}

.cross::after {
  width: 2px;
  height: 100%;
  left: 50%;
  top: 0;
}