how to make scrolling horizontal transistion in css code example

Example: horizontal scroll menu fade edges

.navbar
    float: left
    height: 40px
    min-width: 100%
    display: flex
    flex-wrap: wrap

    .navbar-item
        padding: 13px 0px
        font-size: 12px
        line-height: 14px
        text-transform: uppercase
        display: inline-block
        float: left
        margin: 0px 10px

        &.active
            padding: 13px 0px 11px 0px
            border-bottom: 2px solid $light-blue

        &:hover
            cursor: pointer

        a 
            color: $dark-grey
            font-weight: 600
            text-decoration: none

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Html Example