Edit in JSFiddle

<div class="page-preloader">
   <div class="preloader">
		   <b>L</b><b>O</b><b>A</b><b>D</b><b>I</b><b>N</b><b>G</b>
   </div>
</div>

* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
body {
    font-size: 14px;
    line-height: 28px;
    font-family: 'Open Sans', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
.page-preloader {
    background: -webkit-linear-gradient(to bottom right, #50a3a2 0%, #53e3a6 100%);
    background-image: linear-gradient(to bottom right, #50a3a2 0%, #53e3a6 100%);
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    align-content: center; 
    justify-content: center; 
    overflow: auto;   
}

.preloader {
  width: 100%;
  text-align: center;
}
.preloader>b {
    display: inline-block;
    font-size: 30px;
    line-height: 1.5;
    -webkit-animation: flip 3s ease-out infinite;
    animation: flip 3s ease-out infinite;
    text-shadow: 4px 4px 8px rgba(0, 0, 0, 0.45);
}

.preloaderr>b:first-of-type {
    -webkit-animation-delay: 0s;
    animation-delay: 0s
}

.preloader>b:nth-of-type(2) {
    -webkit-animation-delay: .1s;
    animation-delay: .1s
}

.preloader>b:nth-of-type(3) {
    -webkit-animation-delay: .2s;
    animation-delay: .2s
}

.preloader>b:nth-of-type(4) {
    -webkit-animation-delay: .3s;
    animation-delay: .2s
}

.preloader>b:nth-of-type(5) {
    -webkit-animation-delay: .4s;
    animation-delay: .4s
}

.loader>b:nth-of-type(6) {
    -webkit-animation-delay: .5s;
    animation-delay: .5s
}

.preloader>b:last-of-type {
    -webkit-animation-delay: .6s;
    animation-delay: .6s
}
@keyframes flip {
    0% {
        color: #444;
        font-weight: 400;
        letter-spacing: -.1em
    }

    30%,70% {
        color: #444;
        font-weight: 400
    }

    35%,65% {
        color: #444;
        font-weight: 700;
        -webkit-transform: rotateY(0);
        -moz-transform: rotateY(0);
        -ms-transform: rotateY(0);
        transform: rotateY(0)
    }

    40% {
        color: #f75353
    }

    45% {
        color: #51d466
    }

    50% {
        color: #fcd419;
        font-weight: 700;
        letter-spacing: .3em;
        -webkit-transform: rotateY(360deg);
        -moz-transform: rotateY(360deg);
        -ms-transform: rotateY(360deg);
        transform: rotateY(360deg)
    }

    55% {
        color: #cb79e6
    }

    60% {
        color: #609cec
    }

    100% {
        color: #444;
        letter-spacing: -.1em;
        font-weight: 400
    }
}