Check out example codes for "css loading spinner with text". It will help you in understanding the concepts better.

Code Example 1

.centered {
  text-align: center;
}

.spinner.loading {
  display: none;
  padding: 50px;
  text-align: center;
}

.loading-text {
  width: 90px;
  position: absolute;
  top: calc(50% - 15px);
  left: calc(50% - 45px);
  text-align: center;
}

.spinner.loading:before {
  content: "";
  height: 90px;
  width: 90px;
  margin: -15px auto auto -15px;
  position: absolute;
  top: calc(50% - 45px);
  left: calc(50% - 45px);
  border-width: 8px;
  border-style: solid;
  border-color: #2180c0 #ccc #ccc;
  border-radius: 100%;
  animation: rotation .7s infinite linear;
}

@keyframes rotation {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(359deg);
  }
}

Learn ReactJs, React Native from akashmittal.com