body{
    background: #747474;
}
.form-signin input[type="text"],.form-signin input[type="password"] {
    width: 100%;
}

.vertical-offset-100 {
    padding-top: 100px;
}
.img-responsive {
    display: block;
    max-width: 100%;
    height: auto;
    margin: auto;
}
.panel {
    margin-bottom: 20px;
    background-color: rgba(255, 255, 255, 0.75);
    border: 1px solid transparent;
    border-radius: 4px;
    -webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, .05);
    box-shadow: 0 1px 1px rgba(0, 0, 0, .05);
}

.titre{
    text-align: center;
    font-weight: 700;
}