Box in Testimonial Section

Hello,
Can you please tell me how to move the box in the center?

https://s11.postimg.org/pp6g6hdlv/Immagine.png

This my Style.css:

/*—————————————-
** Testimonial —–
—————————————–*/
.testimonial {
background: #e15836;
padding-bottom: 90px;
}
.testimonial .section-header .section-legend {
color: #FFF;
}
#client-feedbacks .feedback-box {
width: 30%;
background: #FFFFFF;
padding: 25px;
margin: 130px;
text-align: left;
border-radius: 4px;
-webkit-box-shadow: none;
box-shadow: none;
display: inline-block;
z-index: 5;
vertical-align: top;
}
.feedback-box .message {
font-size: 15px;
color: #777777;
}
.feedback-box .client {
margin-top: 30px;
height: 73px;
position: relative;
}
.feedback-box .quote {
float: left;
font-size: 45px;
line-height: 80px;
}
.feedback-box .client-info {
float: left;
margin-left: 18px;
padding-top: 15px;
}
.feedback-box .client-info .client-name {
font-family: ‘Homemade Apple’, serif;
color: #404040;
}
.feedback-box .client-info .client-company {
font-size: 13px;
margin-top: -3px;
}
.feedback-box .client-image {
float: right;
width: 73px;
height: 73px;
border-radius: 50%;
overflow: hidden;
border: 3px solid #f6f6f6;
}
.feedback-box .client-image img {
width:100%;
height:100%;
}
.customNavigation {
text-align: center;
}
.owl-theme .owl-controls .owl-page span {
background: #886e0e;
border-radius: 50%;
}
.customNavigation a {
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
.zerif_grid_col_4 > div,
.zerif_grid_col_3 > div,
.zerif_grid_col_2 > div,
.zerif_grid_col_1 > div {
margin-bottom: 30px;
text-align: center;
}
.zerif_grid_col_4 {
float: left;
width: 23%;
margin: 0 1.25% 0 1.25%;
}
.zerif_grid_col_3 {
float: left;
width: 31.5%;
margin: 0 1.25% 0 1.25%;
}
.zerif_grid_col_2 {
float: left;
width: 48%;
margin: 0 1.75% 0 1.75%;
}
.zerif_grid_col_1 {
float: left;
width: 100%;
}
.zerif_grid_first {
margin-left: 0;
padding-left: 0;
}
.zerif_grid_last {
margin-right: 0;
padding-right: 0;
}
#client-feedbacks.zerif_grid .feedback-box {
width: 100%;
}