// after before
    %theme-afbf{
        position: absolute;
        content: '';
    }


    // bg color
    @mixin bg-color($color, $opacity) {
        background: rgba($color, $opacity);
    }
    

    // placeholder input
    @mixin tp-placeholder {
        &::-webkit-input-placeholder {
            @content;
        }
        &:-moz-placeholder {
            @content;
        }
        &::-moz-placeholder {
            @content;
        }
        &:-ms-input-placeholder {
            @content;
        }
    }

    // animate 
    @mixin animate($animation, $duration, $repeat, $easing) {
        -webkit-animation: $animation $duration $repeat $easing;
           -moz-animation: $animation $duration $repeat $easing;
            -ms-animation: $animation $duration $repeat $easing;
            -o-animation: $animation $duration $repeat $easing;
                animation: $animation $duration $repeat $easing;
    }

    // filter 
    @mixin filter($value) {
        -webkit-filter: $value;
            filter: $value;
    }

    // appearance for select
    @mixin appearance($value) {
        -webkit-appearance: $value;
            -moz-appearance: $value;
            -ms-appearance: $value;
            -o-appearance: $value;
            appearance: $value;
    }
    
    // keyframes 
    @mixin keyframes($name) {
        @-webkit-keyframes #{$name} {
            @content; 
        }
        @-moz-keyframes #{$name} {
            @content;
        }
        @-ms-keyframes #{$name} {
            @content;
        }
        @keyframes #{$name} {
            @content;
        } 
    }

    //backgroud 
    @mixin background {
        background-position: center;
        background-size: cover;
        background-repeat: no-repeat;
    }
      
    //transition
    @mixin transition($time) {
        -webkit-transition: all $time ease-out 0s;
        -moz-transition: all $time ease-out 0s;
        -ms-transition: all $time ease-out 0s;
        -o-transition: all $time ease-out 0s;
        transition: all $time ease-out 0s;
    }
    
    // transform
    @mixin transform($transforms) {
        -webkit-transform: $transforms;
        -moz-transform: $transforms;
        -ms-transform: $transforms;
        -o-transform: $transforms;
        transform: $transforms;
    }
    
    //border
    @mixin border-radius($man) {
    -webkit-border-radius: $man;
    -moz-border-radius: $man;
    -o-border-radius: $man;
    -ms-border-radius: $man;
    border-radius: $man;
    }
    
    // sentence case
    @mixin sentence-case() {
        text-transform: lowercase;
        &:first-letter {
            text-transform: uppercase;
        }
    }

    // Flexbox display
    @mixin flexbox() {
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    }
    
    // Box shadows
    @mixin box-shadow($shadow) {
    -webkit-box-shadow: $shadow;
        -moz-box-shadow: $shadow;       
        -ms-box-shadow: $shadow;       
        -o-box-shadow: $shadow;       
            box-shadow: $shadow;
    }