B2主题美化- 增加首页公告模块

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B2PRO主题版本：4.2.6

1、首页模块增加自定义模块

代码如下：

 <div class="alert alert-warning alert-dismissible fade show" role="alert">
<strong><span class="badge bg-danger">
Hello,宝贝！<sup aria-hidden="true" class="spinner-grow spinner-grow-sm ml-1 small" role="status" style=" width: .5rem; height: .5rem; "></sup></span></strong> <span>欢迎您的到来，网站目前在维护中，如访问异常，请稍后访问</span>
<a class="badge bg-warning text-dark" href="#"
               rel="nofollow noopener noreferrer" target="_blank">
升级VIP
</a>
</div>

2、在主题或子主题引入css

/*首页横幅开始*/
.alert-warning {
    color: #664d03;
    background-color: #fff3cd;
    border-color: #ffecb5;
}

.alert-dismissible {
    padding-right: 3rem;
}
.alert {
    position: relative;
    padding: 1rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: .25rem;
}

@media (prefers-reduced-motion: reduce){
.fade {
    transition: none;
}
}
.fade {
    transition: opacity .15s linear;
}
.bg-danger {
    background-color: #dc3545!important;
}.badge {
    display: inline-block;
    padding: .35em .65em;
    font-size: .75em;
    font-weight: 700;
    line-height: 1;
    color: #fff;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: .25rem;
}
.bg-warning {
    background-color: #ffc107!important;
}
.text-dark {
    color: #212529!important;
}.alert-dismissible .btn-close {
    position: absolute;
    top: 0;
    right: 0;
    z-index: 2;
    padding: 1.25rem 1rem;
}
.btn-close {
    box-sizing: content-box;
    width: 1em;
    height: 1em;
    padding: .25em .25em;
    color: #000;
    border: 0;
    border-radius: .25rem;
    opacity: .5;
}

@media (prefers-reduced-motion: reduce){
.spinner-border, .spinner-grow {
    -webkit-animation-duration: 1.5s;
    animation-duration: 1.5s;
}
}

.spinner-grow-sm {
    width: 1rem;
    height: 1rem;
}.spinner-grow {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    vertical-align: -.125em;
    background-color: currentColor;
    border-radius: 50%;
    opacity: 0;
    -webkit-animation: .75s linear infinite spinner-grow;
    animation: .75s linear infinite spinner-grow;
}.small, small {
    font-size: .875em;
}
@keyframes spinner-grow {
  0% {
    transform: scale(0);
  }
  50% {
    opacity: 1;
    transform: none;
  }
}

.btn-close:hover {
    color: #000;
    text-decoration: none;
    opacity: .75;
}

sup.spinner-grow.spinner-grow-sm.ml-1.small {

    margin-left: 4px;

    margin-bottom: 4px;
}
/*首页横幅结束*/

本质来说就是DIV+CSS的一段代码，其他的自行对着修改