@import 'reset.css';

.timer {
    margin-top: 15px;
    width: 282px;
    /* height: 130px; */
    position: absolute;
    left: 50%;
    margin-left: -141px;
}
.timer input {
    text-align: center;
    width: 80px;
    height: 45px;
    line-height: 45px;
    font-size: 30px;
    background-color: #000;
    color: #fff;
    border-radius: 15px;
}
.timer span {
    display: inline-block;
    height: 45px;
    line-height: 45px;
    font-size: 30px;
    text-align: center;
    padding: 0 5px;
    vertical-align: middle;
}
.timer .btn button {
    width: 50px;
    height: 50px;
    opacity: 0.7;
    border-radius: 50%;
    font-weight: bold;
    margin: 0 7px;
    text-align: center;
    line-height: 50px;
}
.timer .btn {
    text-align: center;
    /* 对于button/input等标签，
    也可以通过给父级设置text-align的样式来使其在其父级内居中 */
    margin-top: 20px;
}