.timeline {
    list-style: none;
    padding: 20px 0 20px;
    position: relative;
    margin: 0 auto;
}
.timeline:before {
    top: 0;
    bottom: 0;
    position: absolute;
    content: "";
    width: 3px;
    background-color: #d9d9d9;
    margin-left: -1.5px;
    left: 20px;
}
@media (min-width: 576px) {
    .timeline{
        width: 500px;

    }
    .timeline:before {
        left: 50%;
    }
}
@media (min-width: 768px) {
    .timeline{
        width: 600px;
    }
}
@media (min-width: 1200px) {
    .timeline{
        width: 800px;
    }
}
.timeline > li {
    margin-bottom: 20px;
    position: relative;
    padding-left: 55px;
}
.timeline > li:after, .timeline > li:after {
    content: "";
    display: table;
    clear: both;

}
.timeline > li .panel {
    width: 220px;
    float: left;
    border-radius: 3px;
    overflow: hidden;
    position: relative;
    /*background: #fff;*/
    box-shadow: 1px 2px 80px 0 rgba(0, 0, 0, 0.1);
}
.timeline > li .panel summary {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    user-select: none;
    outline: none;
    padding: 20px;
    margin-bottom: 0;
    transition: all 600ms cubic-bezier(0.23, 1, 0.32, 1);
    /*transition-property: margin, background;*/
    font-weight: 600;
    text-align: center;
}
.timeline > li .panel summary .icono-sumary{
    background-color: #12becd;
    border: 2px solid #FFFFFF;
    border-radius: 50%;
    height: 60px;
    width: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
}
.timeline > li .panel summary .icono-sumary span{
    color: #FFFFFF;
    font-size: 40px;
    margin-top: 7px;
}
.timeline > li .panel summary::-webkit-details-marker {
    display: none;
}
.timeline > li .panel summary:hover {
    background: rgba(0, 0, 0, 0.1);
}
.timeline > li .panel p {
    text-align: justify;
    font-size: 17px;
    font-weight: 300;
    padding: 0 20px 10px;
}
.timeline > li .panel[open] summary {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 25px;
}
@media (min-width: 576px) {
    .timeline > li {
        padding-left: 0;
    }
    .timeline > li .panel {
        /*width: 100px;*/
        width: 50%;
    }
    .timeline > li .panel p {
        font-size: 20px;
    }
    .timeline > li:not(:nth-child(even)) {
        padding-right: 90px;
    }
    .timeline > li:nth-child(even) {
        padding-left: 90px;
    }
    .timeline > li:nth-child(even) > :nth-child(even) {
        float: right;
    }
}
@media (min-width: 1200px){
    .timeline > li .panel summary{
        font-size: 18px;
    }
}
.timeline > li > .icon {
    color: #12becd;
    width: 50px;
    height: 50px;
    line-height: 41px;
    font-size: 2em;
    text-align: center;
    position: absolute;
    left: 20px;
    margin-left: -25px;
    background-color: #FFF;
    border: 4px solid #12becd;
    z-index: 499;
    border-radius: 50%;
    font-weight: 600;
}
@media (min-width: 576px) {
    .timeline > li > .icon {
        left: 50%;
    }
}