html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,dl,dt,dd,ol,nav ul,nav li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,summary,time,mark,audio,video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline;}
article, aside, details, figcaption, figure,footer, header, hgroup, menu, nav, section {display: block;}
ol,ul{list-style:none;margin:0px;padding:0px;}
blockquote,q{quotes:none;}
blockquote:before,blockquote:after,q:before,q:after{content:'';content:none;}
table{border-collapse:collapse;border-spacing:0;}

html, body{
  font-size: 100%;
  font-family: Arial, Helvetica, sans-serif;
  background: url(fondo.jpg) no-repeat -200px center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.container {
  display: flex;
  flex-wrap:  wrap;
  justify-content: flex-end;
  max-width: 50%;
  margin-left: auto;
  padding:  0;
}

.row {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}

.column {
  flex-basis: 100%;
}

.row__logo {
  display: flex;
  justify-content:  flex-end;
}

.row__logo img {
  width: 100%;
  height: auto;
  max-width:  250px;
}

.big-button {
  border-radius: 20%;
  width: 35vh;
  height: 35vh;
  background: white;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: 2vh;
  color: #333;
  box-shadow: 0 5px 12<px rgba(50, 50, 93, 0.5), 0 5px 5px rgba(0, 0, 0, 0.2);
  transition: box-shadow 350ms;
  transition: transform 350ms;
  cursor: pointer;
}

 .big-button:hover {
  box-shadow: 0 15px 35px rgba(50, 50, 93, 0.5), 0 5px 10px rgba(0, 0, 0, 0.5);
  transform: translateY(-5px);
}

 .big-button:active {
  box-shadow: 0 5px 5px rgba(50, 50, 93, 0.2), 0 5px 5px rgba(0, 0, 0, 0.2);
  transform: translateY(-5px);
}

 .big-button .big-button__title {
  font-size: 8vh;
  text-align: center;
  transition: transform 350ms;
  user-select: none;
}

 .big-button:hover .big-button__title {
  transform: translateY(-10px);
}

@media screen and (min-width: 800px) {
  .column {
    flex: 1;
  }
}

@media screen and (min-device-width: 768px) and (max-device-width: 800px)  {
  .container {
    height: 100%;
    margin: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    align-content: center;  
  }

  .row {
    width: auto;
  }

  .column {
    flex: 1;
  }
}