button
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.app button {
float: left;
border: 0;
outline: 0;
width: 155px;
height: 40px;
line-height: 30px;
border-radius: 3px;
color: #fff;
background: rgba(14, 71, 112, 0.2);
box-sizing: border-box;
cursor: pointer;
opacity: 0.8;
transition: 0.4s;
}
.app button:hover {
opacity: 1;
color: #2d93db;
background-color: rgba(255, 255, 255, 1);
}