サンプルhtml
html例：<span class="icon-log-out"></span>
css例：
.icon-login:before {
content: "\e646";
}
chevron-with-circle-down chevron-with-circle-up cog cross grid magnifying-glass mail menu5 plus2 popup text check chevron-down chevron-left chevron-right chevron-small-down chevron-small-left chevron-small-right chevron-small-up chevron-thin-down chevron-thin-left chevron-thin-right chevron-thin-up chevron-up home search zoom-in zoom-out cog2 cogs menu menu2 menu3 menu4 plus minus cancel-circle cross2 checkmark checkmark2 circle-up circle-right circle-down circle-left