.cases{
position:absolute;
left:0px;
top:0px;
z-index:1;
}

.voltar{
position:absolute;
left:0px;
top:0px;
z-index:2;
width:33%;
right:65%;
}

.whatsapp{
position:absolute;
left:0px;
top:0px;
z-index:2;
width:33%;
left:65%;
}

body{
margin: 0;
font-family: Arial, Helvetica, sans-serif;
}

.topnav{
overflow: hidden;
background-color: #a21f31;
text-align: center;
color: white;
}

.ul{
overflow: hidden;
list-style-type: none;
padding: 0;
margin: 0;
background-color: #333;
}

.li{
float: left;
}

.content{
background-color: white;
padding: 15px;
height: 100%;
}

.footer{
background-color: #a21f31;
padding: 10px;
text-align: center;
color: white;
}

.flex-container {
justify-content: space-around;
display: flex;
flex-wrap: wrap;
background-color: white;
}

.flex-container > div{
width:220px;
align-items: center;
}