/*不可直接引用bootstarp,否则会对页面样式有影响*/
  .alert {
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    border-radius: 4px
}

.alert-info {
    color: #31708f;
    background-color: #d9edf7;
    border-color: #bce8f1
}

.alert-dismissable,
.alert-dismissible {
    padding-right: 35px
}

.alert-dismissable .close,
.alert-dismissible .close {
    position: relative;
    top: -5px;
    right: -21px;
    color: inherit
}

button.close {
    -webkit-appearance: none;
    padding: 0;
    cursor: pointer;
    background: 0 0;
    border: 0
}

.close {
    float: right;
    font-size: 21px;
    font-weight: 700;
    line-height: 1;
    color: #000;
    text-shadow: 0 1px 0 #fff;
    filter: alpha(opacity=20);
    opacity: .2
}