/* https://codepen.io/ashmind/pen/zqaqpB */
html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #4684ee;
}

.loader {
    color: #fff;
    font-family: Consolas, Menlo, Monaco, monospace;
    font-weight: bold;
    font-size: 30vh;
    opacity: 0.8;
}
    .loader span {
        display: inline-block;
        animation: pulse 0.4s alternate infinite ease-in-out;
    }
    .loader span:nth-child(odd) {
        animation-delay: 0.4s;
    }

@keyframes pulse {
    to {
        transform: scale(0.8);
        opacity: 0.5;
    }
}