JSFiddle - React, Tailwind, and code Playground

HTML

<div class="Evento">
    <div class="DataEvento">20/05 a 30/06</div>
    <div class="NomeEvento">some event some the best event</div>

</div>

<div class="Evento">
    <div class="DataEvento">20/05 a 30/06</div>
    <div class="NomeEvento">Another event</div>

</div>

<div class="Evento">
    <div class="DataEvento">20/05 20/05 a 30/06 ff</div>
    <div class="NomeEvento">Just other event</div>

</div>

CSS

div.Evento{
 text-align: left; 
 margin: 10px;    
 overflow: hidden;
 outline: dashed 1px black;
    border-radius: 10px;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    background-color: #BCBCBC;
}

div.NomeEvento {
        float:right;
        width: 70%;
        padding: 5px;
        text-align: left;
        font-weight: bolder;
        font-size: 1.5em;
        
        
}

div.DataEvento {
        float:right;
        width: 15%;
        min-width:130px;        
        margin-left: 10px;       
        padding: 5px;
        text-align: left;
     outline: dashed 1px black;
}