.loader {
    color: #fff;
    font-family: Consolas, Menlo, Monaco, monospace;
    font-weight: bold;
    font-size: 78px;
    opacity: 0.8;
}
.loader:before {
    content: "{";
    display: inline-block;
    animation: pulse 0.4s alternate infinite ease-in-out;
}
.loader:after {
    content: "}";
    display: inline-block;
    animation: pulse 0.4s 0.3s alternate infinite ease-in-out;
}

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