.container1 {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  min-height: 70vh;
  background-color: white;
}

.loader {
  max-width: 15rem;
  width: 100%;
  height: auto;
  stroke-linecap: round;
}

circle {
    color: blue;
  fill: none;
  stroke-width: 3.5;
  -webkit-animation-name: preloader;
          animation-name: preloader;
  -webkit-animation-duration: 3s;
          animation-duration: 3s;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
  -webkit-animation-timing-function: ease-in-out;
          animation-timing-function: ease-in-out;
  -webkit-transform-origin: 170px 170px;
          transform-origin: 170px 170px;
  will-change: transform;
}
circle:nth-of-type(1) {
  stroke-dasharray: 550;
}
circle:nth-of-type(2) {
  stroke-dasharray: 500;
}
circle:nth-of-type(3) {
  stroke-dasharray: 450;
}
circle:nth-of-type(4) {
  stroke-dasharray: 300;
}
circle:nth-of-type(1) {
  -webkit-animation-delay: -0.15s;
          animation-delay: -0.15s;
}
circle:nth-of-type(2) {
  -webkit-animation-delay: -0.3s;
          animation-delay: -0.3s;
}
circle:nth-of-type(3) {
  -webkit-animation-delay: -0.45s;
  -moz-animation-delay:  -0.45s;
          animation-delay: -0.45s;
}
circle:nth-of-type(4) {
  -webkit-animation-delay: -0.6s;
  -moz-animation-delay: -0.6s;
          animation-delay: -0.6s;
}

@-webkit-keyframes preloader {
  50% {
    -webkit-transform: rotate(360deg);
            transform: rotate(360deg);
  }
}

@keyframes preloader {
  50% {
    -webkit-transform: rotate(360deg);
            transform: rotate(360deg);
  }
}