body,
p {
    margin: 0;
}
a {
    text-decoration: none;
    color: #000;
}
ul,
li {
    padding: 0;
    margin: 0;
    list-style: none;
}
button {
    outline: none;
    border: 0;
}
.left {
    float: left;
}
.right {
    float: right;
}

/* 去除input type=number自带的箭头 */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
}
input[type="number"] {
    -moz-appearance: textfield;
}
.form-group:after {
    content: "";
    display: block;
    clear: both;
}