.btn-hover {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    cursor: pointer;
    text-align: center;
    border: none;
    background-size: 300% 100%;
    border-radius: 50px;
    moz-transition: all .4s ease-in-out;
    -o-transition: all .4s ease-in-out;
    -webkit-transition: all .4s ease-in-out;
    transition: all .4s ease-in-out;
}

    .btn-hover:hover {
        background-position: 100% 0;
        moz-transition: all .4s ease-in-out;
        -o-transition: all .4s ease-in-out;
        -webkit-transition: all .4s ease-in-out;
        transition: all .4s ease-in-out;
    }

    .btn-hover:focus {
        outline: none;
    }
    /*màu xanh lục nhạt*/
    .btn-hover.color-luc {
        background-image: linear-gradient(to right, #25aae1, #40e495, #30dd8a, #2bb673);
        box-shadow: 0 4px 15px 0 rgba(49, 196, 190, 0.75);
    }
    /*màu vàng*/
    .btn-hover.color-vang {
        background-image: linear-gradient(to right, #f7971e, #ffd200);
        box-shadow: 0 4px 15px 0 rgba(242, 184, 10, 0.75);
    }
    /*màu cam*/
    .btn-hover.color-cam {
        background-image: linear-gradient(to right, #f5ce62, #e43603, #fa7199, #e85a19);
        box-shadow: 0 4px 15px 0 rgba(229, 66, 10, 0.75);
    }
    /*màu tím nhạt*/
    .btn-hover.color-timnhat {
        background-image: linear-gradient(to right, #667eea, #764ba2, #6B8DD6, #8E37D7);
        box-shadow: 0 4px 15px 0 rgba(116, 79, 168, 0.75);
    }
    /*màu hồng cam*/
    .btn-hover.color-hongcam {
        background-image: linear-gradient(to right, #fc6076, #ff9a44, #ef9d43, #e75516);
        box-shadow: 0 4px 15px 0 rgba(252, 104, 110, 0.75);
    }
    /*màu xanh lá*/
    .btn-hover.color-xanhla {
        background-image: linear-gradient(to right, #0ba360, #3cba92, #30dd8a, #2bb673);
        box-shadow: 0 4px 15px 0 rgba(23, 168, 108, 0.75);
    }
    /*màu xanh lá non*/
    .btn-hover.color-lanon {
        background-image: linear-gradient(to right, #009245, #FCEE21, #00A8C5, #D9E021);
        box-shadow: 0 4px 15px 0 rgba(83, 176, 57, 0.75);
    }
    /*màu tím đậm*/
    .btn-hover.color-timdam {
        background-image: linear-gradient(to right, #6253e1, #852D91, #A3A1FF, #F24645);
        box-shadow: 0 4px 15px 0 rgba(126, 52, 161, 0.75);
    }
    /*màu đen*/
    .btn-hover.color-den {
        background-image: linear-gradient(to right, #29323c, #485563, #2b5876, #4e4376);
        box-shadow: 0 4px 15px 0 rgba(45, 54, 65, 0.75);
    }
    /*màu xanh đậm*/
    .btn-hover.color-xanhdam {
        background-image: linear-gradient(90deg, rgba(9,9,121,1) 15%, rgba(0,212,255,1) 100%);
        box-shadow: 0 4px 15px 0 rgba(45, 54, 65, 0.75);
    }
    /*màu xanh dương*/
    .btn-hover.color-xanhduong {
        background-image: linear-gradient(to right, #25aae1, #4481eb, #04befe, #3f86ed);
        box-shadow: 0 4px 15px 0 rgba(65, 132, 234, 0.75);
    }
    /*màu hồng*/
    .btn-hover.color-hong {
        background-image: linear-gradient(to right, #ed6ea0, #ec8c69, #f7186a, #FBB03B);
        box-shadow: 0 4px 15px 0 rgba(236, 116, 149, 0.75);
    }
    /*màu đỏ*/
    .btn-hover.color-do {
        background-image: linear-gradient(to right, #eb3941, #f15e64, #e14e53, #e2373f);
        box-shadow: 0 5px 15px rgba(242, 97, 103, .4);
    }