css伪元素::before画箭头

向上箭头

.pre {position: relative;width: 100%;height: 20px;background-color: rgba(0, 0, 0, 0.6);cursor: pointer;
}.pre::before {content: "";width: 12px;height: 12px;border: solid #fff;border-width: 2px 2px 0 0;transform: translate(-50%, -50%) rotate(-45deg);position: absolute;left: 50%;top: 70%;
}

向下箭头

.next {position: relative;width: 100%;height: 20px;background-color: rgba(0, 0, 0, 0.6);cursor: pointer;
}.next::before {content: "";width: 12px;height: 12px;border: solid #fff;border-width: 0 0 2x 2px;transform: translate(-50%, -50%) rotate(-45deg);position: absolute;left: 50%;top: 70%;
}

向左箭头

.pre {position: relative;width: 100%;height: 20px;background-color: rgba(0, 0, 0, 0.6);cursor: pointer;
}.pre::before {content: "";width: 12px;height: 12px;border: solid #fff;border-width: 2px 0 0 2px;transform: translate(-50%, -50%) rotate(-45deg);position: absolute;left: 50%;top: 70%;
}

向右箭头

.pre {position: relative;width: 100%;height: 20px;background-color: rgba(0, 0, 0, 0.6);cursor: pointer;
}.pre::before {content: "";width: 12px;height: 12px;border: solid #fff;border-width: 0 2px 2px 0;transform: translate(-50%, -50%) rotate(-45deg);position: absolute;left: 50%;top: 70%;
}

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