style.css

@import url(https://fonts.googleapis.com/css?family=Roboto:300);
*,
*:after,
*:before {
  box-sizing: border-box;
}

.text{
  color: #fcfdfe;
  font-size: 30px;
  font-family:  Roboto, sans-serif;
  padding: 5px;
}

.topBar{
  background-color: #34373e;
}

.container-flow{
  margin-top: 50px;
  padding: 20px;
}

body {
  background: linear-gradient(to right, #feac5e, #c779d0, #4bc0c8);
  background-size: 400% 400%;
  position: relative;
  animation: change 10s ease-in-out infinite;
}

@keyframes change {
  0%{
    background-position: 0 50%;
  }
  50%{
    background-position: 100% 50%;
  }
  100%{
    background-position: 0 50%;
  }
}

.widget {
  background: rgba(245, 245, 245, 0.05);
  border: 2px solid #00293c;
  border-radius: 10px;
  box-shadow: 0px 10px 15px -5px rgba(0, 0, 0, 0.418);
  position: left;
  overflow: hidden;
  margin: 5px;
}

.details {
  font-family: Roboto, sans-serif;
  display: flex;
  flex-direction: column;
  margin-top: 5px;
  margin-bottom: 5px;
  margin-left: 15px;
}

.temperature {
  color: #1e1f26;
  font-weight: 600;
  font-size: 36px;
}

.summary {
  color: #102a49;
  font-weight: 600;
  width: 95%;
  margin-top: -4px;
  padding-bottom: 8px;
  border-bottom: 2px solid #fcfdfe;
}

.summaryText {
  margin: 0;
  margin-top: 0px;
  font-size: 20px;
}

.wind {
  color: #1e1f26;
  font-size: 15px;
  font-weight: 600;
  margin-top: 5px;
}

.input {
  width: 80%;
  padding: 0px;
  background: transparent;
  border: none;
  outline: none;
  margin-top: 10px;
  color: #fcfdfe;
  font-family: Roboto, sans-serif;
  font-size: 18px;
  font-weight: 500;
  padding-left: 5px;
}

.line-box {
  position: relative;
  width: 80%;
  height: 1px;
  background: linear-gradient(to right, #feac5e, #c779d0, #4bc0c8);
}

.line {
  position: absolute;
  width: 0%;
  height: 2px;
  top: 0px;
  left: 50%;
  transform: translateX(-50%);
  background: #fcfdfe;
  transition: ease .6s;
} 
  
.input:focus + .line-box .line {
  width: 100%;
}