.contact{
    display: none;
}
.mask{
    color: #fff;
    background: rgba(0,0,0,0.7);
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 31.67%;
}
.mask>div{
    max-width: 1300px;
    margin: 40px auto;
}
.mask p{
    margin: 12px auto;
}
.mask b{
    font-size: 18px;
}
.mask span{
    font-size: 14px;
    margin-left: 20px;
}
 .b_bg{
     padding:2px 5px;
     background: #fff;
     color: #3f3f3f;
     border-radius: 10px;
}
 .b_border{
     padding: 2px 5px;
     border-radius: 10px;
     border: 1px solid #fff;
 }
 .form{
     max-width: 1256px;
     margin: 50px auto;
 }
 .form h2{
     text-align: center;
     font-size: 30px;
     margin: 20px auto;
 }
 .form input{
     border: none;
     background: #eeeeee;
     font-size: 18px;
     line-height: 2;
     padding: 10px 20px;
     width: 47.53%;
     margin: 25px auto;
 }
 .form textarea{
     width: 100%;
     font-size: 18px;
     line-height: 1.5;
     border: none;
     background-color: #eeeeee;
     padding: 20px;
     margin: 25px auto;
 }
input::-webkit-input-placeholder, textarea::-webkit-input-placeholder {
    color: #3f3f3f;
    font-size: 18px;
    line-height: 1.5;
    font-weight: normal;

}
input:-moz-placeholder, textarea:-moz-placeholder {
    color: #3f3f3f;
    font-size: 18px;
    line-height: 1.5;
    font-weight: normal;

}
input:-ms-input-placeholder, textarea:-ms-input-placeholder {
    color: #3f3f3f;
    font-size: 18px;
    line-height: 1.5;
    font-weight: normal;

}
.form a{
    display: block;
    width: 100%;
    background: -webkit-linear-gradient(to right, #007fea ,#00e0a9); /* Safari 5.1 - 6.0 */
    background: -o-linear-gradient(to right, #007fea,#00e0a9); /* Opera 11.1 - 12.0 */
    background: -moz-linear-gradient(to right, #007fea, #00e0a9); /* Firefox 3.6 - 15 */
    background: linear-gradient(to right, #007fea , #00e0a9); /* 标准的语法 */
    text-align: center;
    color: #fff;
    font-size: 24px;
    line-height: 3;
    margin: 25px auto;

}

@media screen and (max-width: 1700px){
    .mask {
        height: 36.67%;
    }
}
@media screen and (max-width: 1500px){
    .mask {
        height: 40%;
    }
}
@media screen and (max-width:1300px){
    .mask {
        height: 43%;
    }
    .mask>div {

        margin: 20px;
    }
    .form {
        max-width: 1256px;
        margin: 50px 20px;
    }
}
@media screen  and (max-width: 1024px){
    .mask{
        display: none;
    }
    .contact{
        display: block;
        margin: 0 20px;
    }
    .contact p{
        margin: 12px auto;
    }
    .contact b{
        font-size: 24px;
    }
    .contact span{
        font-size: 18px;
        margin-left: 20px;
    }
    .b_bg{
        padding:2px 5px;
        background: #fff;
        color: #3f3f3f;
        border-radius: 10px;
    }
    .b_border{
        padding: 2px 5px;
        border-radius: 10px;
        border: 1px solid #fff;
    }
}

@media screen and (max-width: 750px){
    .contact {
        display: block;
        margin: 0px 10px;
    }
    .contact p {
        margin: 10px auto;
    }
    .contact b {
        font-size: 14px;
    }
    .contact span {
        font-size: 12px;
        margin-left: 10px;
    }
    .form h2 {
        text-align: center;
        font-size: 18px;
        margin: 10px auto;
    }
    .form textarea {

        margin: 10px auto;
    }
    .form input {
        font-size: 14px;
        padding: 10px 20px;
        width: 100%;
        margin: 10px auto;
    }
    input::-webkit-input-placeholder, textarea::-webkit-input-placeholder {
        color: #3f3f3f;
        font-size: 14px;
        line-height: 1.5;
        font-weight: normal;

    }
    input:-moz-placeholder, textarea:-moz-placeholder {
        color: #3f3f3f;
        font-size: 14px;
        line-height: 1.5;
        font-weight: normal;

    }
    input:-ms-input-placeholder, textarea:-ms-input-placeholder {
        color: #3f3f3f;
        font-size: 14px;
        line-height: 1.5;
        font-weight: normal;

    }
    .form a {

        font-size: 18px;
        margin: 0px auto;
    }
}
@media screen and (max-width:414px){
    .contact b {
        font-size: 14px;
        display: block;
    }
}