CyberPanel/static/baseTemplate/assets/elements/ribbon.css

/* The ribbons */

.corner-ribbon {
    position: absolute;
    z-index: 5;
    top: -1px;
    left: -1px;
    overflow: hidden;
    width: 48px;
    height: 48px;
}
.corner-ribbon > div,
.corner-ribbon > a {
    line-height: 38px;
    position: absolute;
    top: -6px;
    left: -26px;
    display: block;
    width: 78px;
    height: 35px;
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
    text-align: center;
}
.corner-ribbon .glyph-icon {
    display: block;
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
}
.corner-ribbon-tr {
    right: -1px;
    left: auto;
    border-top-left-radius: 0;
}
.corner-ribbon-tr > div,
.corner-ribbon-tr > a {
    right: -26px;
    left: auto;
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
}
.corner-ribbon-tr .glyph-icon {
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
}
/* Alternate */

.ribbon {
    position: absolute;
    top: -1px;
    left: -1px;
    overflow: hidden;
    width: 100px;
    height: 100px;
}
.ribbon:after,
.ribbon:before {
    position: absolute;
    z-index: -1;
    top: 2px;
    left: 77px;
    width: 10px;
    height: 10px;
    content: '';
    -webkit-transform: rotate(-45deg);
    background-color: rgba(0, 0, 0, .3);
}
.ribbon:before {
    top: 79px;
    left: 0;
}
.ribbon > div {
    position: relative;
    z-index: 100;
    top: 15px;
    left: -30px;
    width: 120px;
    padding: 7px 0;
    -webkit-transform: rotate(-45deg);
    text-align: center;
    color: #fff;
}
.ribbon-tr {
    right: -1px;
    left: auto;
}
.ribbon-tr:after,
.ribbon-tr:before {
    right: 79px;
    left: auto;
    -webkit-transform: rotate(45deg);
}
.ribbon-tr:before {
    top: 79px;
    right: 2px;
}
.ribbon-tr > div {
    right: -8px;
    left: auto;
    -webkit-transform: rotate(45deg);
}