a.bt__a{
    display: block;
    color: #fff;
    font-size: 1.8em;
}
a.bt__a span{
    color: #fff;
    font-size: 1.6em;
    display: inline-block;
    width: 66%;
}

a.bt__a:hover{
    text-decoration: none;
}

.bt__base{
    width:70%;
    border-radius:8px;
    padding:0 10px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    height: 90px;
    margin: auto;
}

.bt__base img{
    display: inline-block;
    height: 40%;
    margin: 0 10px;
    
}

img.bt__file{
    height: calc(94% - 10px);
    width: auto;
    margin: 15px 10px 0 0;
}
.color1{
    background:#1d67c0;
    color:#fff;
}

.color1:hover{
    background-color: #4089e2;
}

@media screen and (max-width:540px){
    .bt__base{
        width:94%;
    }
    a.bt__a span{
        font-size: 1.3em;
        width:54%;
    }
}