.mailbox{
    width:900px;
    margin:20px auto;
}
.mailbox .header{
    font-size: 16px;
    color:#c70f02;
    text-align:justify;
    margin-bottom: 15px;
}
.cont1{
    margin-bottom: 15px;
}
.cont1 h2{
    font-size: 18px;
    color:#1e1e1e;
    letter-spacing: 1px;
    margin-bottom: 10px;
}
.cont1 p{
    color:#707070;
    font-size: 15px;
    line-height:27px;
    letter-spacing: 1px;
}
.letter{
    text-align: center;
}
.letter-a{
    width:130px;
    height:40px;
    display: inline-block;
    margin: 0 auto;
    border:1px solid #015293;
    background-color: #015293;
    line-height:40px;
    text-align: center;
    border-radius:5px;
    margin-top: 30px;
    font-size:15px;
    color:#ffffff;
    -webkit-appearance: none;
}