.center-block {
    float: none;
    margin-left: auto;
    margin-right: auto;
}

.input-group .icon-addon .form-control {
    border-radius: 0;
}

.icon-addon {
    position: relative;
    color: #555;
    display: block;
}

    .icon-addon:after,
    .icon-addon:before {
        display: table;
        content: " ";
    }

    .icon-addon:after {
        clear: both;
    }

    .icon-addon.addon-md .glyphicon,
    .icon-addon .glyphicon,
    .icon-addon.addon-md .fa,
    .icon-addon .fa {
        position: absolute;
        z-index: 2;
        left: 10px;
        font-size: 14px;
        width: 20px;
        margin-left: -2.5px;
        text-align: center;
        padding: 10px 0;
        top: 1px
    }

    .icon-addon.addon-lg .form-control {
        line-height: 1.33;
        height: 46px;
        font-size: 18px;
        padding: 10px 16px 10px 40px;
    }

    .icon-addon.addon-sm .form-control {
        height: 30px;
        padding: 5px 10px 5px 28px;
        font-size: 12px;
        line-height: 1.5;
    }

    .icon-addon.addon-lg .fa,
    .icon-addon.addon-lg .glyphicon {
        font-size: 18px;
        margin-left: 0;
        left: 11px;
        top: 4px;
    }

    .icon-addon.addon-md .form-control,
    .icon-addon .form-control {
        padding-left: 30px;
        float: left;
        font-weight: normal;
    }

    .icon-addon.addon-sm .fa,
    .icon-addon.addon-sm .glyphicon {
        margin-left: 0;
        font-size: 12px;
        left: 5px;
        top: -1px
    }

    .icon-addon .form-control:focus + .glyphicon,
    .icon-addon:hover .glyphicon,
    .icon-addon .form-control:focus + .fa,
    .icon-addon:hover .fa {
        color: #2580db;
    }