body{
    background-color: rgb(238, 251, 100);
}

a {
    text-decoration: none;
    color: inherit;
}
.inner-menu-list{
    width: 250px;
    display: block;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid rgb(243, 74, 113);
    list-style: none;
    text-decoration: none;
}
.inner-menu-list-item{
    border-top: 1px solid rgb(243, 74, 113);
    overflow: hidden;
}

.inner-menu-list-item:target .sub-menu{
    max-height: 20em;
}


.sub-menu-h{
    display: block;
    padding: 20px 15px;
    background-color: rgb(243, 74, 113);
    color: #fff;
    position: relative;

}
/* triangle */
.sub-menu-h:before{
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    right: 15px;
    bottom: -10px;
    z-index: 1;
    border-left: 6px solid transparent;
    border-right:6px solid transparent;
    border-top:12px solid rgb(243, 74, 113);
    
}

.sub-menu{
    background: blue;
    overflow: hidden;
    max-height:0em;
    transition: 500ms ease all;
}
.sub-menu a{
    display: block;
    padding: 20px 15px;
    color: #fff;
    font-size: 16px;
    border-bottom: 1px solid blue;
    position: relative;
    
}
.sub-menu a:before{
    content: '';
    opacity: 0;
    transition: opacity 300ms ease;

}
.sub-menu a:hover{
    background: #273057;
    background: -moz-linear-gradient(top, #111838 0%, #222e68 48%, #243e85 52%, #273e7e 100%);
    background: -webkit-linear-gradient(top, #111838 0%, #222e68 48%, #243e85 52%, #273e7e 100%);
    background: linear-gradient(top, #111838 0%, #222e68 48%, #243e85 52%, #273e7e 100%);
    transition: all 0.3s;
    border-bottom: 1px solid #394c7f;
}

.sub-menu a:hover:after{
    content: '';
    position: absolute;
    height: 0;
    width: 6px;
    right: 0px;
    top:0;
    opacity: 1;
}


.sub-menu a:hover:before{
    content: '';
    position: absolute;
    height: 0;
    width: 5px;
    left: 0;
    top:0;
    opacity: 1;
    /* background-color: #d8d824; */
    border-top: 27px solid transparent;
    border-left: 10px solid lightgreen;
    border-bottom: 27px solid transparent;
}
.sub-menu a:after{
    content: '';
    opacity: 0;
    transition: opacity 300ms ease;

}