.add-subtract{position: relative;display: block;}
.add-subtract::after{content: '';display: block;width: 22px;height: 2px;position: absolute;right: 0px;top: 50%;transform: translateY(-50%);z-index: 2;background-color: #79797A;transition: all .2s linear;}
.add-subtract::before{content: '';display: block;width: 2px;height: 22px;position: absolute;top: 50%;right: 11px;transform: translate(50%,-50%);z-index: 1;background-color: #79797A;transition: all .2s linear;}
.add-subtract-change::after{background-color: var(--v-red-dark);}
.add-subtract-change::before{background-color: var(--v-red-dark);transform: translate(50%,-50%) rotate(-90deg);}
@media (max-width:510px) {
    .add-subtract::after{width: 12px;}
    .add-subtract::before{height: 12px;right: 6px;}
}