.parallax {
    /* The image used */
    /*background-image: url("img_parallax.jpg");*/
  
    /* Set a specific height */
    /*min-height: 500px;*/
  
    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

.expand { 
    transition: all .2s ease-in-out; 
}

.expand-sm:hover { 
    transform: scale(1.10); 
}
  
.expand-lg:hover { 
    transform: scale(1.25); 
}

/*Ribbon*/
.caixa {
    position: relative;
    z-index:0;
  }
  
  /* common */
  .ribbon {
    width: 80px;
    height: 80px;
    overflow: hidden;
    position: absolute;
    z-index: 1;
  }
  .ribbon::before,
  .ribbon::after {
    position: absolute;
    z-index: -1;
    content: '';
    display: block;
    border: 5px solid #2980b9;
  }
  .ribbon span {
    position: absolute;
    display: block;
    width: 136px;
    padding: 7px 0;
    background-color: #3498db;
    box-shadow: 0 5px 10px rgba(0,0,0,.1);
    color: #fff;
    font: 700 15px/1 'Lato', sans-serif;
    text-shadow: 0 1px 1px rgba(0,0,0,.2);
    text-transform: uppercase;
    text-align: center;
  }


  .ribbon_yellow {
    width: 150px;
    height: 150px;
    overflow: hidden;
    position: absolute;
  }
  .ribbon_yellow::before,
  .ribbon_yellow::after {
    position: absolute;
    z-index: -1;
    content: '';
    display: block;
    border: 5px solid #ffc107;
  }
  .ribbon_yellow span {
    position: absolute;
    display: block;
    width: 225px;
    padding: 15px 0;
    background-color: #ffc107;
    box-shadow: 0 5px 10px rgba(0,0,0,.1);
    color: #fff;
    font: 700 18px/1 'Lato', sans-serif;
    text-shadow: 0 1px 1px rgba(0,0,0,.2);
    text-transform: uppercase;
    text-align: center;
  }

  .ribbon_verde {
    width: 150px;
    height: 150px;
    overflow: hidden;
    position: absolute;
  }
  .ribbon_verde::before,
  .ribbon_verde::after {
    position: absolute;
    z-index: -1;
    content: '';
    display: block;
    border: 5px solid #235e31;
  }
  .ribbon_verde span {
    position: absolute;
    display: block;
    width: 225px;
    padding: 15px 0;
    background-color: #235e31;
    box-shadow: 0 5px 10px rgba(0,0,0,.1);
    color: #fff;
    font: 700 18px/1 'Lato', sans-serif;
    text-shadow: 0 1px 1px rgba(0,0,0,.2);
    text-transform: uppercase;
    text-align: center;
  }
  
  /* top left*/
  .ribbon-top-left {
    top: -10px;
    left: -10px;
  }
  .ribbon-top-left::before,
  .ribbon-top-left::after {
    border-top-color: transparent;
    border-left-color: transparent;
  }
  .ribbon-top-left::before {
    top: 0;
    right: 0;
  }
  .ribbon-top-left::after {
    bottom: 0;
    left: 0;
  }
  .ribbon-top-left span {
    right: -25px;
    top: 30px;
    transform: rotate(-45deg);
  }
  
  /* top right*/
  .ribbon-top-right {
    top: -10px;
    right: -10px;
  }
  .ribbon-top-right::before,
  .ribbon-top-right::after {
    border-top-color: transparent;
    border-right-color: transparent;
  }
  .ribbon-top-right::before {
    top: 0;
    left: 0;
  }
  .ribbon-top-right::after {
    bottom: 0;
    right: 0;
  }
  .ribbon-top-right span {
    left: -18px;
    top: 16px;
    transform: rotate(45deg);
  }
  
  /* bottom left*/
  .ribbon-bottom-left {
    bottom: -10px;
    left: -10px;
  }
  .ribbon-bottom-left::before,
  .ribbon-bottom-left::after {
    border-bottom-color: transparent;
    border-left-color: transparent;
  }
  .ribbon-bottom-left::before {
    bottom: 0;
    right: 0;
  }
  .ribbon-bottom-left::after {
    top: 0;
    left: 0;
  }
  .ribbon-bottom-left span {
    right: -25px;
    bottom: 30px;
    transform: rotate(225deg);
  }
  
  /* bottom right*/
  .ribbon-bottom-right {
    bottom: -10px;
    right: -10px;
  }
  .ribbon-bottom-right::before,
  .ribbon-bottom-right::after {
    border-bottom-color: transparent;
    border-right-color: transparent;
  }
  .ribbon-bottom-right::before {
    bottom: 0;
    left: 0;
  }
  .ribbon-bottom-right::after {
    top: 0;
    right: 0;
  }
.ribbon-bottom-right span {
    left: -25px;
    bottom: 30px;
    transform: rotate(-225deg);
}