CSS tips

animation.css

/*Rotation*/
.box {
    animation: rotate 1s ease infinite;
}

@keyframes rotate {
    0% {
        -webkit-transform: rotate(0);
        transform: rotate(0);
    }

    100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}

flex.css

.center {
  display: flex;
  justify-content: center;
  align-items: center;
}

grid.css

.grid {
  display: grid;
  grid-template-columns: 1fr 200px 1fr;
  grid-template-rows: 100px 200px;
}

/**/

/*Even align of items*/
.container {
  justify-content: space-evenly;
  justify-items: center;
  align-content: space-evenly;
  align-items: center;
}