body {
    display: flex;
    flex-direction:column;    
    align-items: center;
    width: 100%;
    height: 100%;
    margin: 0;
}
div#logo {
    width: 100%;
    max-width: 500px;
    margin: 20px;
}

div#logo img {
    width: 100%!important;
}
div#conventie {
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 10px;
    background: aliceblue;
    font-size: 18px;
    font-weight: bold;
    width: 100%;
    max-width: 500px;
}

div#conventie input {
    padding: 5px;
    text-align: center;
    background: transparent;
    border: 1px solid #333;
    width: 100%;
    font-size: 16px;
}

div#conventie > div {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 10px;
}

div#conventie input:focus {
    background: #fff;
}

div#alerte {
    margin: 20px 0;
    width: 100%;
    max-width: 500px;
    padding: 20px 0;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert {
    width:100%;
    position: relative;
    padding: 20px;
    margin-bottom: 10px;
    border: 1px solid transparent;
    border-radius: 10px;
    text-align: center;
}

* {
    box-sizing: border-box;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeeba;
}

div#header {
    width: 100%;
    max-width: 500px;
    text-align: center;
}

div#header h1 {
    font-size: 24px;
}

div#header h2 {
    font-size: 18px;
}