.list-group {
    margin-left: 20%;
    margin-right: 20%;
}

.form-control {
    margin-top: .5%;
}

.btn {
    margin-top: .5%;
}

.list-group-item {
    margin-bottom: 20px;
}

.main {
    margin-left: 20%;
    margin-right: 20%;
}