blog/_src/assets/less/404.less

.page-404 {
    text-align: center;
    
    .entry-title { .hide; }
}

.srverror-title {
    font-size: 2em;
    margin-bottom: @line-height-computed/2;
    color: @text-color-light;
}
.srverror-text {
    font-size: 1.2em;
    letter-spacing: .01em;
    color: @text-color-dimmed
}

@hal-size: 72px;

.hal-9000 {
    width: @hal-size;
    height: @hal-size;
    .border-radius(@hal-size);
    background: #444;
    padding: 1.5em;
    margin: @line-height-computed auto;
    text-align: center;
    position: relative;
    border: 4px solid #ccc;
    box-shadow: inset 0 0 10px #000;
    
    // eye
    &:before {
        content: " ";
        width: 100%;
        height: 100%;
        .border-radius(100%);
        display: block;
        background: red;
        box-shadow: 0 0 5px red, 0 0 10px red, 0 0 15px red, 0 0 20px red, 0 0 25px red, 0 0 30px red, 0 0 40px red;
        .animation(halpulse 7s infinite);
    }
    
    // gloss
    &:after {
        content: "";
        position: absolute;
        width: @hal-size;
        height: @hal-size;
        .border-radius(@hal-size);
        position: absolute;
        left: 0;
        top: 0;
        
        background-image: linear-gradient(to bottom, rgba(255,255,255,.07) 0%, rgba(255,255,255,.07) 40%, rgba(255,255,255,0) 41%);
        
        .rotate(-60deg);
    }
}

@-webkit-keyframes halpulse {
    0%   { opacity: 1  }
    50%  { opacity: .6 }
    100% { opacity: 1  }
}
@keyframes halpulse {
    0%   { opacity: 1  }
    50%  { opacity: .6 }
    100% { opacity: 1  }
}