.caja_3:hover .efecto {-webkit-transform:scale(1.3);transform:scale(1.3);}
  .efecto:hover{
    -webkit-filter: grayscale(100%); /* Chrome, Safari, Opera */
    filter: grayscale(100%);
  }
  .caja_3 {
    width: 100%;
    overflow: hidden;
    position: relative;
    
}
.caja_3 img {
    position: relative;
    width: 100%;
    top: 0;
    left: 0;
}
.caja_3 .ovrly {
    background: rgba(196, 196, 196, 0.5);
    height: 100%;
    left: 0;
    top: 100%;
    width: 100%;
    position: absolute;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;
}
.caja_3 .buttons {
    position: absolute;
    bottom: -100%;
    left: 50%;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;
    -webkit-transform: translate(-50%, 50%);
    -moz-transform: translate(-50%, 50%);
    -ms-transform: translate(-50%, 50%);
    -o-transform: translate(-50%, 50%);
    transform: translate(-50%, 50%);
}
.caja_3 .buttons .fa {
    margin: 0 1px;
    background: black;
    -webkit-box-shadow: 0 0 1px rgba(0, 0, 0, 0.3);
    -moz-box-shadow: 0 0 1px rgba(0, 0, 0, 0.3);
    box-shadow: 0 0 1px rgba(228,115,51);
    -webkit-border-radius: 10%;
    -moz-border-radius: 10%;
    border-radius: 10%;
    color: rgb(255, 255, 255);
    display: inline-block;
    line-height: 40px;
    font-size: 16px;
    text-align: center;
    text-decoration: none;
    width: 40px;
    height: 40px;
}
.caja_3:hover .buttons {
    bottom: 50%;
}
.caja_3:hover .ovrly {
    top: 0;
}



/* efecto caja 4 */ 
.caja_4{
    width: 100%;
    overflow: hidden;
    position: relative;
    
}
.caja_4 img {
    position: relative;
    width: 100%;
    top: 0;
    left: 0;
}
.caja_4 .ovrly1 {
    background: rgba(228,115,51,0.5);
    height: 100%;
    left: 0;
    top: 100%;
    width: 100%;
    position: absolute;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;
}
.caja_4 .buttons {
    position: absolute;
    bottom: -100%;
    left: 50%;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;
    -webkit-transform: translate(-50%, 50%);
    -moz-transform: translate(-50%, 50%);
    -ms-transform: translate(-50%, 50%);
    -o-transform: translate(-50%, 50%);
    transform: translate(-50%, 50%);
}
.caja_4 .buttons .fa {
    margin: 0 1px;
    background: black;
    -webkit-box-shadow: 0 0 1px rgba(0, 0, 0, 0.3);
    -moz-box-shadow: 0 0 1px rgba(0, 0, 0, 0.3);
    box-shadow: 0 0 1px rgba(0, 0, 0, 0.3);
    -webkit-border-radius: 10%;
    -moz-border-radius: 10%;
    border-radius: 10%;
    color: rgb(255, 255, 255);
    display: inline-block;
    line-height: 40px;
    font-size: 16px;
    text-align: center;
    text-decoration: none;
    width: 40px;
    height: 40px;
}
.caja_4:hover .buttons {
    bottom: 50%;
}
.caja_4:hover .ovrly1 {
    top: 0;
}




/* efecto caja 5 */
.caja_5{
    width: 100%;
    overflow: hidden;
    position: relative;
    
}
.caja_5 img {
    position: relative;
    width: 100%;
    top: 0;
    left: 0;
}
.caja_5 .ovrly2 {
    background: rgba(45,72,149,0.5);
    height: 100%;
    left: 0;
    top: 100%;
    width: 100%;
    position: absolute;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;
}
.caja_5 .buttons {
    position: absolute;
    bottom: -100%;
    left: 50%;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;
    -webkit-transform: translate(-50%, 50%);
    -moz-transform: translate(-50%, 50%);
    -ms-transform: translate(-50%, 50%);
    -o-transform: translate(-50%, 50%);
    transform: translate(-50%, 50%);
}
.caja_5 .buttons .fa {
    margin: 0 1px;
    background: black;
    -webkit-box-shadow: 0 0 1px rgba(0, 0, 0, 0.3);
    -moz-box-shadow: 0 0 1px rgba(0, 0, 0, 0.3);
    box-shadow: 0 0 1px rgba(0, 0, 0, 0.3);
    -webkit-border-radius: 10%;
    -moz-border-radius: 10%;
    border-radius: 10%;
    color: rgb(255, 255, 255);
    display: inline-block;
    line-height: 40px;
    font-size: 16px;
    text-align: center;
    text-decoration: none;
    width: 40px;
    height: 40px;
}
.caja_5:hover .buttons {
    bottom: 50%;
}
.caja_5:hover .ovrly2 {
    top: 0;
}