blog/assets/css/style.scss

---
--- 

@import "{{ site.theme }}";

.backToTop {
    display: none;
    width: 18px;
    line-height: 1.2;
    padding: 5px 0;
    background-color: #000;
    color: #fff;
    font-size: 12px;
    text-align: center;
    position: fixed;
    _position: absolute;
    right: 10px;
    bottom: 100px;
    _bottom: "auto";
    cursor: pointer;
    opacity: .6;
    filter: Alpha(opacity=60);
}

.post-content {
    font-size: 15px;
    line-height: 1.6;
}

.post-content h1 {
    text-indent: -8px;
    border-bottom: 1px solid #e5e5e5;
}

.post-content h2 {
    text-indent: -6px;
    border-bottom: 1px solid #e5e5e5;
}

.post-content h3 {
    text-indent: -5px;
}

.post-content h4 {
    text-indent: -4px;
}

.post-content h5 {
    text-indent: -3px;
}

.post-content h6 {
    text-indent: -2px;
}

h1 .octicon,
h2 .octicon,
h3 .octicon,
h4 .octicon,
h5 .octicon,
h6 .octicon {
    visibility: hidden;
}

h1:hover .octicon,
h2:hover .octicon,
h3:hover .octicon,
h4:hover .octicon,
h5:hover .octicon,
h6:hover .octicon {
    visibility: visible;
}

.octicon {
    fill: currentColor;
    padding: 0;
    margin-left: -16px;
    vertical-align: middle;
}

div.highlight {
    position: relative;
}

div.highlight:hover button {
    opacity: 1
}

div.highlight button {
    opacity: 0;
    position: absolute;
    top: 0.5rem;
    right: 1rem;
    height: 2em;
    transition: all 0.2s ease-out
}

div.highlight button:active,
div.highlight button:focus,
div.highlight button:hover {
    opacity: 1
}