*{
    margin: 0; 
    padding: 0; 
    color: #333; 
    font-size: 14px; 
    font-family: 微软雅黑;
}
a {
    text-decoration: none;
    color: #000000;
}

li {
    list-style: none;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.column-center{
    display: flex;
    align-items: center;
}

.row-center{
    display: flex;
    justify-content: center;
}

.flex-row {
    display: flex;
    flex-direction: row;
}
.flex-column{
    display: flex;
    flex-direction: column;
}

.flex-between {
    display: flex;
    justify-content: space-between;
}
.flex-wraps{
    display: flex;
    flex-wrap: wrap;
}
.flex-around{
    display: flex;
    justify-content: space-around;
}

.row-end{
    display: flex;
    justify-content: flex-end;
}
.column-end{
    display: flex;
    align-items: flex-end;
}


@keyframes myfirst_animate
    {
        0%{
            opacity: 0;
             
        }
        10%{
            opacity: 0;
            transform: scale(1.09); 
        }
        10%{
            opacity: 0.1;
            transform: scale(1.08); 
        }
        20%{
            opacity: 0.2;
            transform: scale(1.07); 
        }
        30%{
            opacity: 0.4;
            transform: scale(1.06); 
        }
        50%{
            opacity: 0.5;
            transform: scale(1.05); 
        }
        60%{
            opacity: 0.6;
            transform: scale(1.04); 
        }
        70%{
            opacity: 0.7;
            transform: scale(1.03); 
        }
        80%{
            opacity: 0.8;
            transform: scale(1.02); 
        }
        90%{
            opacity: 0.9;
            transform: scale(1.01); 
        }
      
        100%{
            transform: scale(1);
            opacity: 1;
        }
    }

    .active_animate{
        animation:myfirst_animate 2s linear;
       
    }