body {
    background-color: #D9F1F3;
}
a:hover{
    text-decoration: none;
}
.sust{
   font-family:'Lato';
   font-size: 46px;
   text-align: center;
   padding-top:50px;
   font-weight: bold;
   padding-left: 5px;
   padding-right: 5px;
   line-height: 55px;
}
.step{
    font-family:'Lato';
    font-size: 24px;
    text-align: center;
    margin-top: 30px;
    padding-left: 30px;
    padding-right: 30px;
 
}
.bn{
    background: #2669BA;
    /*box-shadow: 0px 4px 4px rgba(0, 0, 0, 0.25);*/
    border-radius: 10px;
    width: 375px;
    height: 68px;
   text-align: center;
   margin-top: 50px;
   margin-left: auto;
   margin-right:auto;
   display: flex;
   justify-content: center;
   align-items: center;
}
.bn:hover{
    background-color:navy;
}
.bn h1{
    color:white;
    font-size:22px;
    padding-top: 5px;
    font-family:'Lato';
}
.rectangle{
    width: 100%;
    background: #D9F1F3;
}
.box {
    display: flex;
    flex-flow: column;
    height: 100%;
}
/* Extra small devices (phones, 600px and down) */
@media only screen and (max-width: 450px) {

    .sust{
        font-size:30px;
        font-weight: bold;
        text-align: center;
    }
    .step{
        font-size:22px;
        text-align: center;
    }
    .bn{
        width: 187px;
        height: 37px;
    }
    .bn h1{
        color:white;
        font-size:12px;
        padding-top: 8px;
    }
}