.container {
    max-width: 320px;
    margin: auto;
}
.container2 {
    max-width: 800px;
    margin: auto;
}
fieldset {
    margin: 2em 0;
}

fieldset > div {
    margin: 1em 0;
}

.form-item > label {
    display: inline-block;
    width: auto;
}

.container {
    max-width: 600px;
    margin: 40px auto;
    padding: 20px;
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

fieldset {
    border: none;
    padding: 0;
    margin: 0;
}

legend {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
}

.form-item {
    margin-bottom: 20px;
}

.form-item label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-item input[type="text"],
.form-item input[type="password"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
}

.bouton {
    background-color: #4CAF50;
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
}

.bouton:hover {
    background-color: #3e8e41;
}

.créécompte {
    display: block;
    margin-top: 20px;
    text-align: center;
    font-size: 16px;
    color: #337ab7;
    text-decoration: none;
}

.créécompte:hover {
    color: #23527c;
}

input:invalid:not(:focus):not(:placeholder-shown){
    box-shadow: 0 0 5px 2px red;
}

span.error-msg{
    visibility: hidden;
}

input:invalid:not(:focus):not(:placeholder-shown) + span.error-msg{
    visibility: visible;
    color:red;
}