.explication{
    margin-right: 10%;
    margin-left: 10%;
    margin-top: 10px;
    margin-bottom: 50px;
    padding-right: 20px;
    padding-left: 20px;
    padding-top: 10px;
    padding-bottom: 10px;
    background-color: lightgoldenrodyellow;
    border: 2px dotted #555555;
    text-align: left;
}

.explication h1{
    margin-left: 10px;
}

li{
    list-style-type: none;
    position: relative;
}

.explication li::before{
    content: "";
    position: absolute;
    top: .35em;
    left: 0;
    width: 0;
    height: 0;
    border-width: 5px;
    border-style: solid;
    border-color: transparent transparent transparent #555555;
}

th td{
    border: solid 1px;
    border-color: #555555;
}
 table{
    border-collapse: collapse;
    margin: 10px;
    width: 680px;
    height: 50px;
    margin-bottom: 50px;
}

th{
    height: 15px;
}

.A1{
    width: 80px;
    background-color: lightgoldenrodyellow
}

.A2{
    width : 200px;
}

.B1{
    width: 80px;
    background-color: #EEEEEE;
}