.content_in{margin:0px 40px 0px 40px}
.partners img{
-webkit-filter: grayscale(100%);
filter: grayscale(100%);
filter: gray;
transition:0.5s}

.partners img:hover{
-webkit-filter: grayscale(0%);
filter: grayscale(0%);
filter: color;
transition:0.5s}