codepen.css

    @import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,600,700);

    *, 
    *::before,
    *::after {
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
    }

    * {
        padding: 0;
        margin: 0;
        list-style: none;
        line-height: 1em;
    }

    header {
        text-align: center;
        margin-bottom: 2em;
    }

    body {
        font-family: "Source Sans Pro";
        background-color: #f0f2f5;
    }

    .page-title {
        margin: 2em 0 .2em;
        font-size: 20px;
        text-transform: uppercase;
        line-height: 1.4;
        color: #434a54;
    }

    .page-description {
        font-size: 13px;
        font-weight: normal;
        color: #aab2bd;
    }
    .page-description a {
        color: #ec87c0;
        text-decoration: none;
    }
    .page-description a:hover {
        color: #d770ad;
    }


    .container {
        width: 780px;
        margin: 0 auto;
    }

    .palete {
        border-radius: 5px;
        background-color: #fff;
        -webkit-box-shadow: 0px 3px 0px 0px rgba(226, 228, 231, 0.75);
        -moz-box-shadow:    0px 3px 0px 0px rgba(226, 228, 231, 0.75);
        box-shadow:         0px 3px 0px 0px rgba(226, 228, 231, 0.75);
    }

    .palete-color {
      position: relative;
    }
    .palete-color,
    .palete-color__square {
        height: 50px;
    }

    .palete-color__square {
        width: 50%;
        float: left;
    }
    .palete-color__square:hover {
      width: 100%;
      position: absolute;
    }

    .palete-color__lighten {
        -webkit-border-top-left-radius: 5px;
        -moz-border-radius-topleft: 5px;
        border-top-left-radius: 5px;
    }
    .palete-color__square.palete-color__lighten:hover  {
       -webkit-border-top-right-radius: 5px;
        -moz-border-radius-topright: 5px;
        border-top-right-radius: 5px;
    }
    .palete-color__darken {
        float: right;
        -webkit-border-top-right-radius: 5px;
        -moz-border-radius-topright: 5px;
        border-top-right-radius: 5px;
    }
    .palete-color__square.palete-color__darken:hover {
        -webkit-border-top-left-radius: 5px;
        -moz-border-radius-topleft: 5px;
        border-top-left-radius: 5px;
    }
    .palete-color__content {
        padding: 10px;
        color: #a9abab;
    }
    .palete-color__name {
        font-size: 12px;
        font-weight: medium;
        text-transform: uppercase;
        color: #444545;
    }
    .palete-color__code {
        font-size: 11px;
        line-height: .8em;
        text-transform: uppercase;
    }

    /* ############
       STYLES
       ############ */
    
    /* Round */
    .palete--round {
      border-radius: 50%;
      text-align: center;
    }
    .palete--round .palete-color {
      height: 50%;
    }
    .palete--round .palete-color__square {
      height: 100%;
    }
    .palete--round .palete-color__lighten {
      border-top-left-radius: 100%;
    }
    .palete--round .palete-color__square.palete-color__lighten:hover {
      -webkit-border-radius: 1000px 1000px 0 0;
      -moz-border-radius: 1000px 1000px 0 0;
      border-radius: 1000px 1000px 0 0;
      /* Border-radius Greater or equal to width*/
    }
    .palete--round .palete-color__darken {
      border-top-right-radius: 100%;
    }
    .palete--round .palete-color__square.palete-color__darken:hover {
      -webkit-border-radius: 1000px 1000px 0 0;
      -moz-border-radius: 1000px 1000px 0 0;
      border-radius: 1000px 1000px 0 0;
      /* Border-radius Greater or equal to width*/
    }

    /* Square */
    .palete--square {} /* must set a height */
    .palete--square .palete-color {
      height: 50%;
    }
    .palete--square .palete-color__square {
      height: 100%;
    }
    .palete--square .palete-color__content {
      padding-top: 18px;
    }
    .palete--square .palete-color__code {
      line-height: 1.4;
    }
    .palete--square .palete-color__code:last-child {
      display: block;
    }



.list-palete {
  width: 340px;
  margin: 0 20px;
  float: left;
}
.list-palete > .palete {
    width: 45%;
    margin: 2.5%;
    float: left;
}

.list-palete > .palete--round,
.list-palete > .palete--square{
  height: 153px;
}


/*
 Examples
 */
.examples { 
  float: left;
  width: 340px;
  margin: 0 20px;
}

.example {
  margin: 40px auto;
}

.example--rectangle {
  width: 200px;
}

.example--round {
  width: 200px;
  height: 200px;
}

.example--square {
  width: 200px;
  height: 200px;
}




    /* ###########
       THEME
       ########### */
    
    /* 
     * Grapefruit  
     */
    .palete-color--melon > .palete-color__lighten {
        background-color: #E0BCBC;
    }
    .palete-color--melon > .palete-color__darken {
        background-color: #E0BCBC;
    }

    /* 
     * Bittersweet  
     */
    .palete-color--bittersweet > .palete-color__lighten {
        background-color: #fc6e51;
    }
    .palete-color--bittersweet > .palete-color__darken {
        background-color: #e9573f;
    }


    /* 
     * Sunflower  
     */
    .palete-color--champagne > .palete-color__lighten {
        background-color: #F1ECCE;
    }
    .palete-color--champagne > .palete-color__darken {
        background-color: #F1ECCE;
    }

    /* 
     * Grass  
     */
    .palete-color--pistachio > .palete-color__lighten {
        background-color: #CEE0BC;
    }
    .palete-color--pistachio > .palete-color__darken {
        background-color: #CEE0BC;
    }

    /* 
     * Mint  
     */
    .palete-color--mint > .palete-color__lighten {
        background-color: #48cfad;
    }
    .palete-color--mint > .palete-color__darken {
        background-color: #37bc9b;
    }

    /* 
     * Aqua  
     */
    .palete-color--ice > .palete-color__lighten {
        background-color: #4fc1e9;
    }
    .palete-color--ice > .palete-color__darken {
        background-color: #3bafda;
    }

    /* 
     * Blue Jeans 
     */
    .palete-color--blue-jeans > .palete-color__lighten {
        background-color: #5d9cec;
    }
    .palete-color--blue-jeans > .palete-color__darken {
        background-color: #4a89dc;
    }

    /* 
     * Lavender  
     */
    .palete-color--lavender > .palete-color__lighten {
        background-color: #CEBCE0;
    }
    .palete-color--lavender > .palete-color__darken {
        background-color: #CEBCE0;
    }

    /* 
     * Pink Rose  
     */
    .palete-color--pink-rose > .palete-color__lighten {
        background-color: #ec87c0;
    }
    .palete-color--pink-rose > .palete-color__darken {
        background-color: #d770ad;
    }

    /* 
     * Light Gray  
     */
    .palete-color--light-gray > .palete-color__lighten {
        background-color: #f5f7fa;
    }
    .palete-color--light-gray > .palete-color__darken {
        background-color: #e6e9ed;
    }

    /* 
     * Medium Gray  
     */
    .palete-color--medium-gray > .palete-color__lighten {
        background-color: #ccd1d9;
    }
    .palete-color--medium-gray > .palete-color__darken {
        background-color: #aab2bd;
    }

    /* 
     * Dark Gray  
     */
    .palete-color--dark-gray > .palete-color__lighten {
        background-color: #656d78;
    }
    .palete-color--dark-gray > .palete-color__darken {
        background-color: #434a54;
    }