html, body{
    height: 100%;
}

body {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    padding: 0;
}

.loader {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    width: 100px;
    height: 100px;
}
.loader > div {
    position: relative;
    display: inline-block;
    width: 31%;
    background: tomato;
    transform: scale(0);
    transform-origin: center center;
    animation: loader 2s infinite linear;
}
.loader > div:nth-of-type(1), .loader > div:nth-of-type(5), .loader > div:nth-of-type(9) {
    animation-delay: 0.4s;
}
.loader > div:nth-of-type(4), .loader > div:nth-of-type(8) {
    animation-delay: 0.2s;
}
.loader > div:nth-of-type(2), .loader > div:nth-of-type(6) {
    animation-delay: 0.6s;
}
.loader > div:nth-of-type(3) {
    animation-delay: 0.8s;
}

.loader > div:nth-of-type(4),
.loader > div:nth-of-type(5),
.loader > div:nth-of-type(6){
    margin: 3% 0;
}

@keyframes loader {
    0% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
    80% {
        transform: scale(1);
    }
    100% {
        transform: scale(0);
    }
}