body {
    background-color: lightblue;
}

h1 {
    color: rgb(0, 0, 0);
    text-align: center;
    font-size: 100px;
}

p {
    font-family: verdana;
    font-size: 20px;
}


.center{
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 50%;
}



.image-left {
    float: left;
    margin: 10px;
    width: 45%;
    height: auto;
}

.image-right {
    float: right;
    margin: 10px;
    width: 45%;
    height: auto;
}

.image-center {
    margin: 30px;
    width: 40%;
    height: auto;
}

.container::after {
    content: "";
    display: table;
    clear: both;
}



/* CSS */
button {
    background-color: #EA4C89;
    border-radius: 8px;
    border-style: none;
    box-sizing: border-box;
    color: #FFFFFF;
    cursor: pointer;
    display: inline-block;
    font-family: "Haas Grot Text R Web", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 14px;
    font-weight: 500;
    height: 40px;
    line-height: 20px;
    list-style: none;
    margin: 0;
    outline: none;
    padding: 10px 16px;
    position: relative;
    text-align: center;
    text-decoration: none;
    transition: color 100ms;
    vertical-align: baseline;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
}

button:hover,
button:focus {
    background-color: #F082AC;
}

#caca {
    z-index:10;
    position: absolute;   /* ou relative */
    left: 50%;
    top: 50%; /* optionnel */
}