展示
.code {
padding: 10px 10px 10px 40px;
font-size: 13px;
line-height: 18px;
background-color: #eee;
font-family: "Lucida Console", Consolas, Monaco;
white-space: pre-wrap;
word-break: break-all;
position: relative;
overflow: hidden;
}
.code::before {
content: '01.\A 02.\A 03.\A 04.\A 05.\A 06.\A 07.\A 08.\A 09.\A 10.\A 11.\A 12.\A 13.\A 14.\A 15.\A 16.\A 17.\A 18.\A 19.\A 20.\A 21.\A 22.\A 23.\A 24.\A 25.\A 26.\A 27.\A 28.\A 29.\A 30.\A 31.\A 32.\A 33.\A 34.\A 35.\A 36.\A 37.\A 38.\A 39.\A 40.\A 41.\A 42.\A 43.\A 44.\A 45.\A 46.\A 47.\A 48.\A 49.\A 50.\A 51.\A 52.\A 53.\A 54.\A 55.\A 56.\A 57.\A 58.\A 59.\A 60.\A 61.\A 62.\A 63.\A 64.\A 65.\A 66.\A 67.\A 68.\A 69.\A 70.\A 71.\A 72.\A 73.\A 74.\A 75.\A 76.\A 77.\A 78.\A 79.\A 80.\A 81.\A 82.\A 83.\A 84.\A 85.\A 86.\A 87.\A 88.\A 89.\A 90.\A 91.\A 92.\A 93.\A 94.\A 95.\A 96.\A 97.\A 98.\A 99';
position: absolute;
top: 10px;
bottom: 10px;
left: 0;
text-align: right;
background-color: #fbfbfb;
color: #333;
outline: 100px solid #fbfbfb;
clip: rect(-100px 2em 9999px 0);
/* IE9+ */
clip: rect(-100px 3.5ch 9999px 0);
overflow: hidden;
}