老师，gallery区域的蒙版宽度怎么总长出来一块

 <!--gallery区域-->

  <section class="gallery">

    <div class="container">

      <div class="row">

        <div class="item col-xs-12 col-sm-6 col-md-6 col-lg-8">

           <div class="img-box"> 

            <img src="img/g1.jpg">

              <div class="panel">

                <span class="glyphicon glyphicon-eye-open"></span>

                <span> View</span>

                <div class="cart">SHOP NOW</div>

              </div>

           </div>

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

        </div>

        <div class="item item2 col-xs-6 col-sm-6 col-md-6 col-lg-4">

          <img src="img/g2.jpg">

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

          <div class="panel">

            <span class="glyphicon glyphicon-eye-open"></span>

            <span> View</span>

            <div class="cart">SHOP NOW</div>

          </div>

        </div>

        <div class="item item-small col-xs-6 col-sm-6 col-md-6 col-lg-3">

          <div class="i">

            <img src="img/g3.png">

          </div>

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

          <div class="panel">

            <span class="glyphicon glyphicon-eye-open"></span>

            <span> View</span>

            <div class="cart">SHOP NOW</div>

          </div>

        </div>

        <div class="item item-small col-xs-6 col-sm-6 col-md-6 col-lg-3">

          <div class="i">

            <img src="img/g4.png">

          </div>

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

          <div class="panel">

            <span class="glyphicon glyphicon-eye-open"></span>

            <span> View</span>

            <div class="cart">SHOP NOW</div>

          </div>

        </div>

        <div class="item item-small col-xs-6 col-sm-6 col-md-6 col-lg-3">

          <div class="i">

            <img src="img/g5.png">

          </div>

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

          <div class="panel">

            <span class="glyphicon glyphicon-eye-open"></span>

            <span> View</span>

            <div class="cart">SHOP NOW</div>

          </div>

        </div>

        <div class="item item-small col-xs-6 col-sm-6 col-md-6 col-lg-3">

          <div class="i">

            <img src="img/g6.png">

          </div>

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

          <div class="panel">

            <span class="glyphicon glyphicon-eye-open"></span>

            <span> View</span>

            <div class="cart">SHOP NOW</div>

          </div>

        </div>

        <div class="item item-small col-xs-6 col-sm-6 col-md-6 col-lg-3">

          <div class="i">

            <img src="img/g7.png">

          </div>

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

          <div class="panel">

            <span class="glyphicon glyphicon-eye-open"></span>

            <span> View</span>

            <div class="cart">SHOP NOW</div>

          </div>

        </div>

        <div class="item item-small col-xs-6 col-sm-6 col-md-6 col-lg-3">

          <div class="i">

            <img src="img/g8.png">

          </div>

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

          <div class="panel">

            <span class="glyphicon glyphicon-eye-open"></span>

            <span> View</span>

            <div class="cart">SHOP NOW</div>

          </div>

        </div>

        <div class="item item-small col-xs-6 col-sm-6 col-md-6 col-lg-3">

          <div class="i">

            <img src="img/g9.png">

          </div>

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

          <div class="panel">

            <span class="glyphicon glyphicon-eye-open"></span>

            <span> View</span>

            <div class="cart">SHOP NOW</div>

          </div>

        </div>

        <div class="item item-small col-xs-6 col-sm-6 col-md-6 col-lg-3">

          <div class="i">

            <img src="img/g10.png">

          </div>

          <p>Lorem Ipsum is simply</p>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="glyphicon glyphicon-star-empty"></span>

          <span class="price">$95.00</span>

          <div class="panel">

            <span class="glyphicon glyphicon-eye-open"></span>

            <span> View</span>

            <div class="cart">SHOP NOW</div>

          </div>

        </div>

      </div>

    </div>

  </section>

/*gallery区域*/

.gallery .row{

margin:80px auto;

}

.gallery .row .item{

position:relative;

margin:20px 0;

}

.gallery .row .img-box{

width:100%;

}

.gallery .row img{

width:100%;

}

.gallery .row p{

margin-top:10px;

font-weight:bold;

}

.gallery .row span{

color:#999;

}

.gallery .row .price{

font-size:20px;

position:absolute;

right:15px;

}

.gallery .row .i{

width:238px;

height:251px;

border:1px solid #eee;

text-align:center;

}

.gallery .row .item:hover .i{

border:1px solid #bbb;

}

.gallery .row .item .img-box .panel{

width:100%;

height:60px;

position:absolute;

background:rgba(0,0,0,.7);

bottom:40px;

border-radius:0;

line-height:60px;

padding:0 20px;

display:none;

}

.gallery .row .item:hover .panel{

display:block;

}

.gallery .row .item2 .panel{

width:330px;

}

.gallery .row .item-small .panel{

width:238px;

}

.gallery .row .item .panel span{

color:#fff;

margin-right:4px;

}

.gallery .row .item .panel .cart{

width:120px;

height:30px;

border:2px solid #fff;

color:#fff;

float:right;

line-height:30px;

text-align:center;

font-size:14px;

margin-top:13px;

}

.gallery .row .item .panel .cart:hover{

color:#F07818;

border:2px solid #F07818;

cursor:pointer;

}