styleListe.css

html,body{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family:Arial, Helvetica, sans-serif;
}

ul li{
    list-style-type: none;
}

	/*********************** 	LISTE DES TACHES 	*************************/

h2{
    color: rgb(7, 7, 145);
    font-size: 30px;
    font-stretch: expanded;
	text-align:center;
}

/*Input*/

.input-taches{
    width: 100%;
    border: none;
    outline: none;  
    border-bottom:solid 2px rgb(7, 7, 145);
    text-align: center;
}

#input-ajouter-tache::placeholder{
    font-size: 18px;
    color: rgb(11, 177, 248);
}

#input-ajouter-tache{
    font-size: 18px;
    color: darkslategray;
}

/*Bouton*/

.btn-ajouter{
    margin-top: 40px;
    border: none;
    border-radius: 7px;
    background-color: rgb(35, 61, 233);
    color: wheat;
    padding: 10px;
	width:10%;
	margin-right:45%;
	margin-left:45%;
}

.btn-ajouter:hover{
    color: rgb(20, 88, 122);
    background-color: rgb(184, 238, 226);
    cursor: pointer;
}

/* liste générée par js */
	
.liste-element{
    background-color: rgb(27, 231, 92);
    color: rgb(47, 9, 64);
    font-size: 20px;
    text-align: left;
    padding: 15px;
    margin-top: 15px;
}

.supprimer{
    background-color:rgb(11, 125, 11);
    color:rgb(194, 226, 235);
    padding:5px;
    border-radius: 5px;
    float: right;
    margin-right: 10px;
    text-align: right;
    transition: 0.2s;
    /*
    text-decoration: none !important;   */
}

.supprimer:hover{
    background-color: brown;
    color: #333333;
    cursor: pointer;
    transform: scale(1.1);
}

/*	Affichage de l'élément après clic	*/

ul li.checked{
    background-color: rgb(182, 240, 195);
    color: rgb(79, 25, 69);
    text-decoration: line-through;
    text-align: center;
}

ul li{
    cursor: pointer;
    transition: 0.2s;
    list-style-type: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 24px;
    border-radius: 5px;
    margin-top: 10px;
}

/*  Ajout du symbole checked   */
	ul li.checked::before {
    content: '';
    position: relative;
    border-color: rgb(85, 15, 106);
    border-style: solid;
    border-width: 0 2px 2px 0;
    top: 0;
    left: 10px;
    transform: rotate(45deg);
    height: 15px;
    width: 5px;
}