.pages-banner-box{
    width: 100%;
    display: block;
    position: relative;
    overflow: hidden;
}
.pages-main-bg{
    width: 100%;
    height: 500px;
    display: block;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}
.pages-banner-img-mask{
    width: 100%;
    height: 100%;
    display: block;
    background-color: #000;
    position: absolute;
    top: 0;
    left: 0;
}
.pages-banner-slong-box{
    height: 100%;
    width: 100%;
    top: 0;
    left: 0;
    display: flex;
    position: absolute;
    z-index: 3;
    flex-direction:column;
    justify-content:center;
    align-items:center;
}
.pages-banner-slong{
    width: 300px;
    height: 60px;
    border: 1px solid #fff;
    text-align: center;
}
.pages-banner-slong h1{
    color: #fff;
    font-size: 28px;
    letter-spacing: 2px;
    line-height: 60px;
}
@media only screen and (max-width: 750px){
    .pages-main-bg{
        height: 300px;
    }
    .pages-banner-slong{
        height: initial;
        width: 200px;
    }
    .pages-banner-slong h1{
        font-size: 24px;
        line-height: 50px;
    }
}
@media only screen and (max-width: 400px){
    .pages-main-bg{
        height: 200px;
    }
    .pages-banner-slong{
        width: 150px;
    }
    .pages-banner-slong h1{
        font-size: 20px;
        line-height: 40px;
    }
}



/*animation*/

@keyframes animation_letter {
    0%{
        letter-spacing: 10px;
    }
    to {
        letter-spacing: 2px;
        opacity: 1;
    }
}