*, ::before, ::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(to right, #42275a, #734b6d); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}

h1 {

    text-align: center;
    margin: 30px auto;
    font-size: 50px;
    color: #f1f1f1;

}

.container-choix {

    display: flex;
    justify-content: center;
    align-items: center;

}

.case {

    flex-shrink: 0;/*pas de déformation en cas de rétrécissement*/
    width: 210px;
    height: 310px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 10px;
    border: 3px solid #000;
    background: #fff;

}

#premiere-case {

    margin-right: 30px;

}

.destroy {

    flex-shrink: 0;
    width: 200px;
    height: 200px;
    border-radius: 25px;
    color: #f1f1f1;
    border: 2px solid #f1f1f1;
    background: #333;
    font-size: 25px;
    display: flex;
    justify-content: center;
    align-items: center;

}

.base {

    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    position: relative;
    width: 200px;
    height: 300px;
    cursor: pointer;

}

.container-cases{

    margin-top: 50px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;

}